### context_processors.py

from django.urls import reverse

def menu_items(request):
    menu_dict = {'menu_items': []}

    if request.user.is_authenticated:
        if request.user.userprofile.is_consultant():
            menu_dict['menu_items'].extend([
                {'name': 'Leads', 'url': reverse('leads_view')},
                {'name': 'Deals', 'url': reverse('deals_view')},
                {'name': 'Customers', 'url': reverse('customers_view')},
                {'name': 'Contacts', 'url': reverse('contacts_view')},
                {'name': 'Consultants', 'url': reverse('consultants_view')},
            ])

        if request.user.userprofile.is_manager():
            menu_dict['menu_items'].extend([
                {'name': 'New Deal', 'url': reverse('deal_new')},
                {'name': 'New Lead', 'url': reverse('lead_new')},
                {'name': 'New Customer', 'url': reverse('customer_new')},
                {'name': 'New Contact', 'url': reverse('contact_new')},
                {'name': 'New Consultant', 'url': reverse('consultant_new')},
            ])

    return menu_dict


## nav.html

...
<ul class="navbar-nav me-auto mb-2 mb-lg-0">
{% for item in menu_items %}
    <li class="nav-item">
        <a class="nav-link" href="{{ item.url }}">{{ item.name }}</a>
    </li>
{% endfor %}
</ul>
...