Как в админке связать поля между собой

class Category(models.Model):
    title = models.CharField(max_length=64)
 
    def chained_relation(self):
        return self.item_set.filter(is_present=True)
 
class Item(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    title = models.CharField(max_length=64)
    is_present = models.BooleanField(default=False)
 
class Product(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    name = models.CharField(max_length = 40)
    price = models.DecimalField(max_digits=3, decimal_places=2)

class ProductsInLine(admin.TabularInline):
    model = Item
 
@admin.register(Product)
class Product(admin.ModelAdmin):
    inlines = [Item,]

class Category(models.Model):
    title = models.CharField(max_length=64)
 
class Item(models.Model):
    category = models.ForeignKey(Category, on_delete=models.CASCADE)
    title = models.CharField(max_length=64)
    is_present = models.BooleanField(default=False)
 
class Product(models.Model):
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    name = models.CharField(max_length = 40)
    price = models.DecimalField(max_digits=3, decimal_places=2)