Actually, I mistated the question slightly. I asked how to switch "back" but the problem is I never used the new format. I was only interested in using it so I could create different discount options. HOWEVER, our company file has not been updated in a while and, I am guessing, is in the "old" format so I can't switch to the new invoice format. 

IF there is a way for me to get there from here please let me know.

Thanks.