Help with calc

users
#1

I use Calc to do invoicing. I use one sheet per invoice and one calc file per day. I calculate total amount invoiced using formula =Sum (sheet2.B25:sheet16:B25). I generate 25 files per month x 12 month. Is there a way I can calculate total amount invoiced in a year by using some formula by parsing the files considering the total of the day is on sheet1.B25Kindly help

Vaibhav BANAIT