First, I select my data label and I type some additional text to give context to the new number I’m about to add to the data label. Then, I right-click the data label to pull up the context menu. Note ...

Type into the text box the text for the label. Repeat to add additional labels. Click the "File" tab, then click "Save As." Type a name for the new graph and click the "Save" button.

Adding line breaks can help make the labels for your data more readable and can even be used to create a dual-label cell. Double-click the cell to which you want to add the line or paragraph break.