Form + Subform suggestion

Hello.

My app has 3 models:
- Customer
- RMA
- Item

Customer hasMany Order hasMany Item.

each model has his own Controller.

everything works smoothly.

now i'm trying to code a particular form (first time for me). my goal
is to do something similar to this:

RMA.code (hidden, this field will be auto-generated)
RMA.customer (selectBox, filled by data coming from a linked model
(Customer.id, Customer.name))
//here's the problem
RMA.items
//the customer should be able to add more than one line, without
saving the Order.
//for example:
Item.Quantity Item.Description
1 Laptop
2 Router
1 Cellphone
//the order should be saved ONLY when the user says so. ("Confirm
Order" button)
//@ "Confirm Order" app should save RMA order and all the items,
creating the proper associations.

What's, in your opinion, the best way to do this?

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