Then after you create an individual item screen for each pizza size and you create the items in there (8, 10, 12 14" in the example below)
After all the items are created, you go back in the PIZZA SELECTION screen, and in each items you go under the VARIATIONS and add all items associated with this kind of pizza
** The value does not have to follow the real pizza size, it was just to make it clearer for the customer after when he wants to add new pizza himself **
The value of the variation will be needed later when you create the group and key.
GROUP AND KEY CREATION
You create a separate group and key only for pizza
You must create a button for each size of pizza, function set to Variance Selector, and the value is the actual value you did use earlier in the item/variations to match the right variation.
After the top bar for sizes is done, you create a button for each kind of pizza (created in the PIZZA SELECTION item screen)