Users models with custom permissions used in the blog https://medium.com/@theparadoxer02/user-groups-with-custom-permissions-in-django-9eaea67b220e

Django-sample-models

from django.contrib.auth.models import AbstractUser
from django.utils import timezone
from django.db import models

class User(AbstractUser):
  """Define the extra fields related to User here"""
  
  first_name = models.CharField(_('First Name of User'), blank = True, max_length = 20)
  last_name = models.CharField(_('Last Name of User'), blank = True, max_length = 20)
  # - - - Some more User fields according to your need s


  # This is the most important part to look upon to  define the custom permissions related to User.
  class Meta:
    permissions = (("can_go_in_non_ac_bus", "To provide non-AC Bus facility"),
                    ("can_go_in_ac_bus", "To provide AC-Bus facility"),
                    ("can_stay_ac-room", "To provide staying at AC room"),
                    ("can_stay_ac-room", "To provide staying at Non-AC room"),
                    ("can_go_dehradoon", "Trip to Dehradoon"),
                    ("can_go_mussoorie", "Trip to Mussoorie"),
                    ("can_go_haridwaar", "Trip to Haridwaar"),
                    ("can_go_rishikesh", "Trip to Rishikesh"))