Does anybody have some suggestions ?

I want to do the following:
To print 2 half size Tax Invoice and Copy Tax invoice on one regular A4 sheet, however not by changing the printer settings because I print other documents on the same printer that need to be regular A4.

So I have to achieve this either through the use of Pastel's forms designer or a utility that will change the printer setting for only this particular document.

All this in an effort to save a tree !