diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index 057c3068..f241dfb1 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -15,6 +15,23 @@ class PostsController < ApplicationController
     { locale: locale }
   end
 
+  # @todo Mover a tu propio scope
+  def new_array
+    @value = params.require(:value).strip
+    @name = params.require(:name).strip
+    id = params.require(:id).strip
+
+    headers['HX-Trigger-After-Swap'] = 'htmx:resetForm'
+
+    render layout: false
+  end
+
+  def new_array_value
+    @value = params.require(:value).strip
+
+    render layout: false
+  end
+
   def index
     authorize Post
 
diff --git a/app/javascript/controllers/array_controller.js b/app/javascript/controllers/array_controller.js
new file mode 100644
index 00000000..66cc2290
--- /dev/null
+++ b/app/javascript/controllers/array_controller.js
@@ -0,0 +1,120 @@
+import { Controller } from "stimulus";
+
+export default class extends Controller {
+  static targets = ["item", "search", "current"];
+
+  connect() {
+    // TODO: Stimulus >1
+    this.newArrayValueURL = new URL(window.location.origin);
+    this.newArrayValueURL.pathname = this.element.dataset.arrayNewArrayValue;
+    this.originalValue = JSON.parse(this.element.dataset.arrayOriginalValue);
+  }
+
+  /*
+   * Al eliminar el ítem, buscamos por su ID y lo eliminamos del
+   * documento.
+   */
+  remove(event) {
+    // TODO: Stimulus >1
+    event.preventDefault();
+
+    this.itemTargets
+      .find((x) => x.id === event.target.dataset.removeTargetParam)
+      ?.remove();
+  }
+
+  /*
+   * Al buscar, eliminamos las tildes y mayúsculas para no depender de
+   * cómo se escribió.
+   *
+   * Luego buscamos eso en el valor limpio, ignorando los items que ya
+   * están activados.
+   *
+   * Si el término de búsqueda está vacío, volvemos a la lista original.
+   */
+  search(event) {
+    const needle = this.searchTarget.value
+      .normalize("NFD")
+      .replace(/[\u0300-\u036f]/g, "")
+      .toLowerCase()
+      .trim();
+
+    if (needle) {
+      for (const itemTarget of this.itemTargets) {
+        itemTarget.style.display =
+          itemTarget.querySelector("input")?.checked ||
+          itemTarget.dataset.searchableValue.includes(needle)
+            ? ""
+            : "none";
+      }
+    } else {
+      for (const itemTarget of this.itemTargets) {
+        itemTarget.style.display = "";
+      }
+    }
+  }
+
+  /*
+   * Obtiene el input de un elemento
+   *
+   * @param [HTMLElement]
+   * @return [HTMLElement,nil]
+   */
+  inputFrom(target) {
+    if (target.tagName === "INPUT") return target;
+
+    return target.querySelector("input");
+  }
+
+  /*
+   * Detecta si el item es o contiene un checkbox/radio activado.
+   *
+   * @param [HTMLElement]
+   * @return [Bool]
+   */
+  isChecked(itemTarget) {
+    return this.inputFrom(itemTarget)?.checked || false;
+  }
+
+  /*
+   * Al cancelar, se vuelve al estado original de la lista
+   */
+  cancel(event) {
+    for (const itemTarget of this.itemTargets) {
+      const input = this.inputFrom(itemTarget);
+
+      input.checked = this.originalValue.includes(itemTarget.dataset.value);
+    }
+  }
+
+  /*
+   * Al aceptar, se envía todo el listado de valores nuevos al _backend_
+   * para que devuelva la representación de cada ítem en HTML. Además,
+   * se guarda el nuevo valor como la lista original, para la próxima
+   * cancelación.
+   */
+  accept(event) {
+    this.currentTarget.innerHTML = "";
+    this.originalValue = [];
+
+    for (const itemTarget of this.itemTargets) {
+      if (!itemTarget.dataset.value) continue;
+      if (!this.isChecked(itemTarget)) continue;
+
+      this.originalValue.push(itemTarget.dataset.value);
+      this.newArrayValueURL.searchParams.set("value", itemTarget.dataset.value);
+
+      // TODO: Renderizarlas todas juntas
+      fetch(this.newArrayValueURL)
+        .then((response) => response.text())
+        .then((body) =>
+          this.currentTarget.insertAdjacentHTML("beforeend", body),
+        );
+    }
+
+    // TODO: Stimulus >1
+    this.element.dataset.arrayOriginalValue = JSON.stringify(
+      this.originalValue,
+    );
+  }
+}
diff --git a/app/javascript/etc/htmx_abort.js b/app/javascript/etc/htmx_abort.js
index 308d0315..75e497ba 100644
--- a/app/javascript/etc/htmx_abort.js
+++ b/app/javascript/etc/htmx_abort.js
@@ -5,3 +5,7 @@ document.addEventListener("turbolinks:click", () => {
     window.htmx.trigger(hx, "htmx:abort");
   }
 });
+
+document.addEventListener("htmx:resetForm", (event) => {
+  event.target.reset();
+});
diff --git a/app/models/metadata_new_array.rb b/app/models/metadata_new_array.rb
new file mode 100644
index 00000000..a76ff9f2
--- /dev/null
+++ b/app/models/metadata_new_array.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+# Implementa la nueva interfaz de 
+class MetadataNewArray < MetadataArray
+
+end
diff --git a/app/views/layouts/application.html.haml b/app/views/layouts/application.html.haml
index eaa15eb4..65d3f777 100644
--- a/app/views/layouts/application.html.haml
+++ b/app/views/layouts/application.html.haml
@@ -25,6 +25,7 @@
       = render 'layouts/breadcrumb'
       = render 'layouts/flash'
 
+      = yield(:post_form)
       = yield
 
       - if flash[:js]
diff --git a/app/views/posts/_new_array_value.haml b/app/views/posts/_new_array_value.haml
new file mode 100644
index 00000000..75c5bf4d
--- /dev/null
+++ b/app/views/posts/_new_array_value.haml
@@ -0,0 +1,2 @@
+.col
+  %p= value
diff --git a/app/views/posts/attributes/_new_array.haml b/app/views/posts/attributes/_new_array.haml
new file mode 100644
index 00000000..79ba22e2
--- /dev/null
+++ b/app/views/posts/attributes/_new_array.haml
@@ -0,0 +1,58 @@
+-#
+  Genera un listado de checkboxes entre los que se puede elegir para guardar
+- id = "#{base}_#{attribute}"
+- name = "#{base}[#{attribute}][]"
+- form_id = "form-#{Nanoid.generate}"
+
+%div{ data: { controller: 'modal array', 'array-original-value': metadata.value.to_json, 'array-new-array-value': site_posts_new_array_value_path(site) } }
+  .form-group
+    = hidden_field_tag name, ''
+    = label_tag id, post_label_t(attribute, post: post)
+    -# Mostramos la lista de valores actuales.
+
+      Al aceptar el modal, se vacía el listado y se completa en base a
+      renderizaciones con HTMX. Para poder hacer eso, tenemos que poder
+      acceder a todos los items dentro del modal (como array.item) y
+      enviar el valor al endpoint que devuelve uno por uno. Esto lo
+      tenemos disponible en Stimulus, pero queremos usar HTMX o técnica
+      similar para poder renderizar del lado del servidor.
+
+      Para poder cancelar, mantenemos el estado original y desactivamos
+      o activamos los ítemes según estén incluidos en esa lista o no.
+    .row.row-cols-1.row-cols-md-2{ data: { target: 'array.current' } }
+      - metadata.value.sort_by(&:remove_diacritics).each do |value|
+        = render 'posts/new_array_value', value: value
+
+    = render 'bootstrap/btn', content: t('.edit'), action: 'modal#show'
+
+  = render 'bootstrap/modal', id: id, modal_content_attributes: { class: 'h-100' }, hide_actions: ['array#cancel'] do
+    - content_for :"#{id}_header" do
+      .form-group.flex-grow-1.mb-0
+        = label_tag id, post_label_t(attribute, post: post)
+        %input.form-control{data: { target: 'array.search', action: 'input->array#search' }, type: 'search', placeholder: t('.filter') }
+
+    - content_for :"#{id}_body" do
+      .form-group.mb-0{ id: "#{id}_body" }
+        -# Eliminamos las tildes para poder buscar independientemente de cómo se escriba
+        - metadata.values.sort_by(&:remove_diacritics).each do |value|
+          .mb-2{ data: { target: 'array.item', 'searchable-value': value.remove_diacritics.downcase, value: value } }
+            = render 'bootstrap/custom_checkbox', name: name, id: "value-#{Nanoid.generate}", value: value, checked: metadata.value.include?(value), content: value
+
+    - content_for :"#{id}_footer" do
+      .input-group.w-auto.flex-grow-1.my-0
+        %input.form-control{form: form_id, name: 'value', type: 'text', placeholder: t('.add_new')}
+        .input-group-append
+          = render 'bootstrap/btn', content: t('.add'), form: form_id, type: 'submit', class: 'mb-0 mr-0'
+      = render 'bootstrap/btn', content: t('.accept'), action: 'array#accept modal#hide', class: 'm-0 mr-1'
+      = render 'bootstrap/btn', content: t('.cancel'), action: 'array#cancel modal#hide', class: 'm-0'
+
+    -# Los formularios para HTMX se colocan por fuera del formulario
+       principal, porque HTML5 no soporta formularios anidados. Los campos
+       quedan unidos al formulario por su atributo `id`.
+
+       Al enviar el formulario se obtiene una nueva opción con el valor
+       y se la agrega al final del listado.
+    - content_for :post_form do
+      %form{ id: form_id, 'hx-get': site_posts_new_array_path(site), 'hx-target': "##{id}_body", 'hx-swap': 'beforeend' }
+        %input{ type: 'hidden', name: 'name', value: name }
+        %input{ type: 'hidden', name: 'id', value: form_id }
diff --git a/app/views/posts/new_array.haml b/app/views/posts/new_array.haml
new file mode 100644
index 00000000..81cdcdea
--- /dev/null
+++ b/app/views/posts/new_array.haml
@@ -0,0 +1,8 @@
+- item_id = "item-#{Nanoid.generate}"
+
+.mb-2{ id: item_id, data: { target: 'array.item', 'searchable-value': @value.remove_diacritics.downcase, value: @value } }
+  .d-flex.flex-row.flex-wrap
+    .flex-grow-1
+      = render 'bootstrap/custom_checkbox', name: @name, id: "value-#{Nanoid.generate}", value: @value, checked: true, content: @value
+    %div
+      %button.btn.btn-sm.m-0{ data: { action: 'array#remove', 'remove-target-param': item_id }}= t('.remove')
diff --git a/app/views/posts/new_array_value.haml b/app/views/posts/new_array_value.haml
new file mode 100644
index 00000000..c71ed3b5
--- /dev/null
+++ b/app/views/posts/new_array_value.haml
@@ -0,0 +1 @@
+= render 'posts/new_array_value', value: @value
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 5e9a2377..88b1db19 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -721,7 +721,16 @@ en:
       save_draft: 'Save as draft'
       invalid_help: 'Some fields need attention! Please search for the fields marked as invalid.'
       sending_help: Saving, please wait...
+    new_array:
+      remove: "Remove"
     attributes:
+      new_array:
+        edit: "Edit"
+        filter: "Start typing to filter..."
+        add_new: "Add new option"
+        add: "Add"
+        accept: "Accept"
+        cancel: "Cancel"
       add: Add
       lang:
         label: Language
diff --git a/config/locales/es.yml b/config/locales/es.yml
index a07b3799..4945c19f 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -729,7 +729,16 @@ es:
       save_draft: 'Guardar como borrador'
       invalid_help: '¡Te faltan completar algunos campos! Busca los que estén marcados como inválidos'
       sending_help: Guardando, por favor espera...
+    new_array:
+      remove: "Eliminar"
     attributes:
+      new_array:
+        edit: "Editar"
+        filter: "Empezá a escribir para filtrar..."
+        add_new: "Agregar nueva opción"
+        add: "Agregar"
+        accept: "Aceptar"
+        cancel: "Cancelar"
       add: Agregar
       lang:
         label: Idioma
diff --git a/config/routes.rb b/config/routes.rb
index 9d5c974a..eb20edce 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -99,6 +99,10 @@ Rails.application.routes.draw do
     nested do
       scope '/(:locale)', constraint: /[a-z]{2}(-[A-Z]{2})?/ do
         post :'posts/reorder', to: 'posts#reorder'
+
+        get :'posts/new_array', to: 'posts#new_array'
+        get :'posts/new_array_value', to: 'posts#new_array_value'
+
         resources :posts do
           get 'p/:page', action: :index, on: :collection
           get :preview, to: 'posts#preview'