class Program(models.Model):
    Name = models.CharField("Program Name", max_length=20)
    DepartmentId = models.ForeignKey(Department, on_delete=models.CASCADE)
    def __str__(self):
        return self.Name
class Class(models.Model):
    Name = models.CharField(max_length=20)
    DepartmentId = models.ForeignKey(Department, on_delete=models.CASCADE)
    ProgramId = models.ForeignKey(Program, on_delete=models.CASCADE)

    def __str__(self):
        return self.Name

class myProgramAdmin(admin.ModelAdmin):
    inlines = [ClassInline]
class ClassInline(admin.StackedInline):
    model = Class
    extra = 0