Mutiple instances of templates

I need to add multiple instances of the invoice template so that I can offer multiple versions formatted differently for various scenarios (Estimate , Orders, invoice, etc.). The underlying data fields are the same but I need to make the front end data entry formats look different and also the printed versions look different. This can easily be done with three instances of the Invoice Template.

It seams that I should be able to add the table structures to the project with Views (ie. Estimate and EstimateDetais), but then how do I get them to use the Invoice Template structure instead of the standard PHPRunner Views?
Any and all help will be appreciated.