class TopLevel(models.Model):
    name = models.CharField(max_length=200)

class LevelOne(models.Model):
    name = models.CharField(max_length=200)
    level = models.ForeignKey('TopLevel')

class LevelTwo(models.Model):
    name = models.CharField(max_length=200)
    level = models.ForeignKey('LevelOne')

class LevelThree(models.Model):
    name = models.CharField(max_length=200)
    level = models.ForeignKey('LevelTwo')

from django.contrib import admin
from nested_inline.admin import NestedStackedInline, NestedModelAdmin
from example.models import *

class LevelThreeInline(NestedStackedInline):
    model = LevelThree
    extra = 1
    fk_name = 'level'


class LevelTwoInline(NestedStackedInline):
    model = LevelTwo
    extra = 1
    fk_name = 'level'
    inlines = [LevelThreeInline]


class LevelOneInline(NestedStackedInline):
    model = LevelOne
    extra = 1
    fk_name = 'level'
    inlines = [LevelTwoInline]


class TopLevelAdmin(NestedModelAdmin):
    model = TopLevel
    inlines = [LevelOneInline]


admin.site.register(TopLevel, TopLevelAdmin)