On the Layout tab in the Data group click the Formula button. Then find Ink Equation button at the left side of the Equation Tools Design tab to invoke the handwriting window. Step 2 Now click the Layout tab and then click the Formula button.
If the cell you selected is at the bottom of a column.
Click the table cell in which you want to insert a formula. To add table cells using the SUM function insert a formula from the Layout tab. Click the table cell where you want your result to appear. SUM LEFT For now click Ok.