Add to the last row, even if I add a row?
I have a spreadsheet for my business with 3 rows: Credit, Debit, and Total. I want the Total column of each row to take the total from the row above, subtract the debit and add the credit and give me the new number. I currently do this with J7−H8+I8, but if I add a row in between what it becomes is J7-H9+I9 instead of changing to J8-H9+I9. Is there another formula that will make this work or a mode I need to set?
MacBook Pro, Mac OS X (10.7.3)