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If you just need a report, you don't really need a template, just use the report Wizard.
Create-->Reports-->Report Wizard.
Select your Union query as the Query (source) and follow the wizard's prompts.
It will lead you through all the Report Options.
;-)
Template are for entire databases, not just reports.
If you need an "example" of a basic Invoice you can view one in the old Northwind sample Database:
http://www.microsoft.com/downloads/details.aspx?familyid=C6661372-8DBE-422B-8676-C632D66C529C&displaylang=en
There is also one in the new Access 2007 Northwind sample database as well, but the database is much more complex.
http://office.microsoft.com/en-us/templates/TC012289971033.aspx?CategoryID=CT102115771033
I'm sure that this will get you what you are after.
;-)
JeffCoachman