Formula for new worksheet on existing workbook that creates one invoice at the end

I have a workbook with multiple worksheets that creates one invoice at the end. I need to be able to add worksheets from time to time and I dont want to have to add in the new formulas into the invoice worksheet. Is there any formulas that will solve this issue?

http://www.eggheadcafe.com/fileupload/-1096192339_Work Tickets

Thanks!

 

-Amy

Hi Amy - I tried to download your file, but it doesn't seem to be out there... I think maybe the file name got cut off at the end.  Can you upload it again, and be sure to paste in the whole file name? (preferably without any spaces in the name).  If you can, I'll take a look.