netbox-community-netbox/netbox/templates/dcim/virtualchassis_add.html

{% extends 'utilities/obj_edit.html' %}
{% load form_helpers %}

{% block form %}
    <div class="panel panel-default">
        <div class="panel-heading"><strong>Virtual Chassis</strong></div>
        <div class="panel-body">
            {% render_field form.name %}
            {% render_field form.domain %}
            {% render_field form.tags %}
        </div>
    </div>
    <div class="panel panel-default">
        <div class="panel-heading"><strong>Member Devices</strong></div>
        <div class="panel-body">
            {% render_field form.site %}
            {% render_field form.rack %}
            {% render_field form.members %}
            {% render_field form.initial_position %}
        </div>
    </div>
{% endblock %}