Database to create yoga and pilates classes from lists of sequences and poses

This tutorial  https://youtu.be/Ou1zwJunbuA was helpful but still not working for me.

Problem is when he is creating the query for subform he has things linked to a customer form at top.

I am just trying to do something that should be simple.

Create a sequence and add into that sequence a load of yoga poses using a combo box.

Once I have done this I guess I can repeat the logic to create a classes form and then use a combo box to add a load of sequences to a class.

Feels like I am wasting hours on something that must be so simple.

Thanks in advance.

Chris