in form side,
everything in 1 page  i usually use web2py load components:
first component is an sqlform.factory() to select the invoice_items
second component is a view for for invoice_item
and third component is sqlform that rever to invoice_header

ref:
http://web2py.com/books/default/chapter/29/12/components-and-plugins#LOAD

another idea is put it like shopping cart
page 1 to select the invoice_item, click button and then redirect to page 2 
to confirmation the items selected
after that click button on page 2 to redirect to page 3 for fill 
invoice_header, submit to post it into database

you can simplify it using css modal or tab

best regards,
stifan

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