Using Airtables as a Order app for agents - Problem

[william_selmo]

Hello Guys,

I’m trying to building a web app form my company.
We need a Sales Order App for our agents, I’ve create:

• Products table
• Customer table
• Orders table

But I have a problem we sell fashion stuff and every product has multiple sizes, how can I make it work like a you select a product and for each size you choose the quantity?

something like this image:

Can you help me???