Hi everybody. First of all I want to tell you that I am a Grails beginner so my question could sound a little silly. I've been researching a little about Grails and I learned that it is enough to write scaffold=true in the domain class file (of course this is the easiest way) and we have all the GUI that implements all the CRUD functionality but with this we can fill just one entity, or at least it is all I know (I told you I am a beginner). The deal is that I want to have just one GSP view to fill an invoice (I am developing a clothing store app). You know there is basically two entities, the first one is the INVOICE itself and the second one is the DETAIL of the invoice. So, one INVOICE can have many DETAILs, like this:
INVOICE
--------
CUSTOMER NAME: Manuel Calles
ADDRESS: 8th Street
DATE: 2011/5/30

DETAIL
-------
ITEM | DESCRIPTION | QUANTITY | UNITARY COST | TOTAL |
-------------------------------------------------------------
a1 | Toshiba Laptop| 1 | 800 | 800 |
b3 | Optical mouse | 2 | 10 | 20 |
-------------------------------------------------------------
TOTAL 820

And I want just one view to fill all this information just like the software some stores are using do. How can I do this with Grails.

Thanks in advance.