netbox/netbox/templates/dcim/virtualchassis_add_member.html

{% extends 'base/layout.html' %}
{% load form_helpers %}

{% block title %}Add New Member to Virtual Chassis {{ virtual_chassis }}{% endblock %}

{% block content %}
    <form action="" method="post" enctype="multipart/form-data" class="form-object-edit">
        {% csrf_token %}
        <div class="card">
            <h5 class="card-header">Add New Member</h5>
            <div class="card-body">
                {% render_form member_select_form %}
                {% render_form membership_form %}
            </div>
        </div>
        <div class="text-end my-3">
            <a href="{{ return_url }}" class="btn btn-outline-danger">Cancel</a>
            <button type="submit" name="_addanother" class="btn btn-outline-primary">Add Another</button>
            <button type="submit" name="_save" class="btn btn-primary">Save</button>
        </div>
    </form>
{% endblock %}