Sometimes it's easier to copy formulas than to create new ones. In this example, you'll see how to copy the January formula and use it to add up the February expenses.
You would select cell B7, which contains the January formula, then position the mouse pointer over the lower-right corner of the cell until the black cross (+) appears. Next, drag the fill handle 
over cell C7. When the fill handle is released, the February total 126.93 appears in cell C7. The formula =SUM(C3:C6) is visible in the formula bar near the top of the worksheet whenever cell C7 is selected.
After the formula is copied, the Auto Fill Options button 
appears to give you some formatting options. In this case you wouldn't need to do anything with the button options. The button disappears when you next make an entry in any cell.
Note You can drag the fill handle to copy formulas only into cells that are next to each other, either horizontally or vertically.
