I created a time sheet for employees which calculates the total wages each week. I copy the worksheet to create a new time sheet for each week. I want all subsequent time sheets (worksheets) after the first one to calculate the total wages to date by adding the total wages of the current sheet to the total on the previous sheet. If for example I am on Week 2, I know how to reference the wages cell from the previous week by using something like ='Week (1)'!M28, but when I copy the Week 2 sheet to create Week 3, the new sheet still references Week 1. I don't want to manually change the sheet number each week. How can I make it reference the previous week automatically?