Use the Formula dialog box to create your formula. Step 2 Now click the Layout tab and then click the Formula button. Follow the onscreen instructions.
There are multiple equations in the drop-down list then scroll down and select one of them to meet your actual needs.
Click in a cell that should contain the sum of the rows. To insert an Excel table in Word 2016 click the Insert tab at the top of the window and then click the Table button. This will bring up the Formula dialog with a default of SUM LEFT. As you update the table it will automatically update the heading as well.