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You can use InlineModelAdmin objects to implement this, although if you want to do nested inlines you should check out this post. Although as that post says:
…it would be a kind of convoluted design to implement.
You didn’t provide any code here so the best I can do is guess your model relationships.
models.py
from django.db import models
class Department(models.Model):
name = models.CharField(max_length=250)
...
class Employee(models.Model):
name = models.CharField(max_length=250)
...
class Company(models.Model):
name = models.CharField(max_length=250)
departments = models.ForeignKey(Department)
employees = models.ForeignKey(Employee)
...
admin.py
from django.contrib import admin
class EmployeeInline(admin.StackedInline):
model = Employee
class DepartmentInline(admin.StackedInline):
model = Department
class CompanyAdmin(admin.ModelAdmin):
list_display = ('name')
inlines = [DepartmentInline, EmployeeInline]
admin.site.register(CompanyAdmin)
Source:stackexchange.com