Tags are a great way to categorize your workbooks for ease of management. They are useful when you have a lot of workbooks. The tags display as filters above the grid. Other users cannot see these tags, they are for your personal use only.
Click the Menu button (on the far right side) of the workbook you want to tag, then type a name for the tag into the Add custom tags box and press Enter. Repeat this step to add more tags for other workbooks.
To remove a tag you no longer need, click the Menu button of the workbook, then click the Delete button on the tag under the tag box.