Add custom inline

src/registrar/admin.py

@@ -69,6 +69,7 @@ class DomainInformationInlineForm(forms.ModelForm):
         widgets = {
             "other_contacts": NoAutocompleteFilteredSelectMultiple("other_contacts", False),
         }
+        template = "django/admin/domain_information_change_form.html"
 
 
 class DomainRequestAdminForm(forms.ModelForm):
@@ -1440,8 +1441,8 @@ class DomainInformationInline(admin.StackedInline):
     from DomainInformationAdmin"""
 
     form = DomainInformationInlineForm
-
     model = models.DomainInformation
+    template = "django/admin/domain_information_inline_change_form.html"
 
     fieldsets = copy.deepcopy(DomainInformationAdmin.fieldsets)
     # remove .gov domain from fieldset

src/registrar/templates/admin/stacked.html

@@ -0,0 +1,51 @@
+{% load i18n admin_urls %}
+{% load i18n static %}
+
+{% comment %}
+This is copied from Djangos implementation of this template, with added "blocks"
+It is not inherently customizable on its own, so we can modify this instead.
+https://github.com/django/django/blob/main/django/contrib/admin/templates/admin/edit_inline/stacked.html
+{% endcomment %}
+
+<div class="js-inline-admin-formset inline-group"
+    id="{{ inline_admin_formset.formset.prefix }}-group"
+    data-inline-type="stacked"
+    data-inline-formset="{{ inline_admin_formset.inline_formset_data }}">
+
+    <fieldset class="module {{ inline_admin_formset.classes }}">
+    {% if inline_admin_formset.formset.max_num == 1 %}
+        <h2>{{ inline_admin_formset.opts.verbose_name|capfirst }}</h2>
+    {% else %}
+        <h2>{{ inline_admin_formset.opts.verbose_name_plural|capfirst }}</h2>
+    {% endif %}
+    {{ inline_admin_formset.formset.management_form }}
+    {{ inline_admin_formset.formset.non_form_errors }}
+
+    {% for inline_admin_form in inline_admin_formset %}<div class="inline-related{% if inline_admin_form.original or inline_admin_form.show_url %} has_original{% endif %}{% if forloop.last and inline_admin_formset.has_add_permission %} empty-form last-related{% endif %}" id="{{ inline_admin_formset.formset.prefix }}-{% if forloop.last and inline_admin_formset.has_add_permission %}empty{% else %}{{ forloop.counter0 }}{% endif %}">
+        <h3><b>{{ inline_admin_formset.opts.verbose_name|capfirst }}:</b> <span class="inline_label">{% if inline_admin_form.original %}{{ inline_admin_form.original }}{% if inline_admin_form.model_admin.show_change_link and inline_admin_form.model_admin.has_registered_model %} <a href="{% url inline_admin_form.model_admin.opts|admin_urlname:'change' inline_admin_form.original.pk|admin_urlquote %}" class="{{ inline_admin_formset.has_change_permission|yesno:'inlinechangelink,inlineviewlink' }}">{% if inline_admin_formset.has_change_permission %}{% translate "Change" %}{% else %}{% translate "View" %}{% endif %}</a>{% endif %}
+        {% else %}#{{ forloop.counter }}{% endif %}</span>
+            {% if inline_admin_form.show_url %}<a href="{{ inline_admin_form.absolute_url }}">{% translate "View on site" %}</a>{% endif %}
+            {% if inline_admin_formset.formset.can_delete and inline_admin_formset.has_delete_permission and inline_admin_form.original %}<span class="delete">{{ inline_admin_form.deletion_field.field }} {{ inline_admin_form.deletion_field.label_tag }}</span>{% endif %}
+        </h3>
+        {% if inline_admin_form.form.non_field_errors %}
+            {{ inline_admin_form.form.non_field_errors }}
+        {% endif %}
+
+        {% for fieldset in inline_admin_form %}
+            {# .gov override #}
+            {% block fieldset %}
+                {% include "admin/includes/fieldset.html" %}
+            {% endblock fieldset%}
+        {% endfor %}
+
+        {% if inline_admin_form.needs_explicit_pk_field %}
+            {{ inline_admin_form.pk_field.field }}
+        {% endif %}
+        {% if inline_admin_form.fk_field %}
+            {{ inline_admin_form.fk_field.field }}
+        {% endif %}
+        </div>
+    {% endfor %}
+    </fieldset>
+
+</div>

src/registrar/templates/django/admin/domain_information_inline_change_form.html

@@ -0,0 +1,6 @@
+{% extends 'admin/stacked.html' %}
+{% load i18n static %}
+
+{% block fieldset %}
+    {% include "django/admin/includes/detail_table_fieldset.html" %}
+{% endblock %}