To start a new line in a cell, press the keys.

To start a new line in a cell, select a column from the excel file. Then press the right key of your mouse or laptop's mousepad. Then select the "Insert new column," after this a cell will appear usually at the bottom of the cell you selected. When you selected numerous cells, and you clicked the right button of your mouse, the cell will notify how many cells you can insert based from the highlighted cell.