Custom Fields for Invoice Using Quickbooks 2007

[Petef56]

I'm setting up a custom invoice using Quickbooks 2007 premier edition.
I'd like to know if it's possible to have some custom fields on an invoice
where I can enter some additional reference information to each
invoice that is sent out. The reference info will be different on each
invoice but the categories will be the same. This info needs to be
entered at the same time the line items and amounts are entered
to the invoice.

For example...

Job Location: ______________________________

Reference Document: _______________________

Case Number: ______________________________


Is it possible?
I'm not looking for step by step instruction, but if it is possible,
just point me in the right direction and I'll try to figure it out.

---pete---