Sales order invoice new design- Print management issue

Hi,

I have added this new design in my sales invoice report.

I want to use this report if a particular check box is set in my sales edit lines form.

However, I am struggling to accomplish this using code.

This reports works like a pro forma but is some what different. But there is no invoice posting in this case too.

Next, I added this report in the print management, but now its printing both the proforma and this new report.

Your help would be highly appreciated.

Thanks in advance.