How can i get make a table model work efficiently?

So,i am making an app for making timetables. and i have run into a problem. I have two models . Timetable and Content.

class Timetable(models.Model):

title=models.CharField(max_length=50)
start_time=models.TimeField(default="8:0")
end_time=models.TimeField(default="4:0")
entries=models.IntegerField(default=3)
theme=models.ForeignKey(Theme,on_delete=models.CASCADE,null=True)
def __str__(self):
    return self.title

def get_absoulte_url(self):
    return reverse('timetable-detail',args=[str(self.id)])

class CellEntry(models.Model):

parent_table=models.ForeignKey(Timetable,on_delete=models.CASCADE)
content=models.CharField(max_length=30)

def __str__(self):
    return self.content

How can i make a form such that i can get the two models to behave like a table in excel? How can i set the value of multiple cellentry's parent_table attribute to be the same value in a view?