Creating a quotation in one form

[ainz]

Hello, this is my first time using Appsheet so I'm sorry if I'm asking a really stupid question.

I'm currently creating an app where employees can directly create a quotation in the app without having to type it manually on Excel. The problem I'm facing right now is quite confusing.

In the form i've created, you can only enter one code for each form. I wish there's a way in putting more codes without having to make more form. For example, the picture I've provided below shows in one quotation there's multiple code for each windows and that's what i want to do in the app, create one full quotation without having to create another form for each codes of window for one customer.