This might be what you want:
The Price List Table is a database of stock and prices.
The Order Table is where you have Pop up menus to select a customer's order.
The first item in each Pop up is a space (if nothing is selected, the Cell appears blank).
The price lookup is done in Column B of the Order Tabler:
=IFERROR(VLOOKUP(A2,Price List :: A:B,2,0)," ")
IFERROR() places a space in the Price Column (B) if nothing is selected from the Pop up in that Row.
Fill Pop ups and formulas down.
Choose "blank" from all Pop ups then Save As Template.
Thanks for the feedback. I did that on a MacBook Pro (OS X operating system). It's easier to have the two Tables on view when setting up the document, and yes I would then move the database to a different sheet. On Mac, formulas continue to work between sheets. I don't know how iPads work, but it seems a good idea to hide the database table if you can. Then your doc will look tidier.
Regards, and Happy Numbers!