Before you add any calculations or checkboxes ... click the "Number Format" drop-down menu, and select "Time." By default, ...

You might also need to include discontinuous regions in the selection. To accommodate these situations, Microsoft Excel includes multiple options for extending and adding to selections.

If you have left out hyphens, Excel does include automatic cell formatting options, allowing you to uniformly add hyphens to a selection of phone numbers, social security numbers or anything else ...

The second way is to search and install the Add-Ins directly from Excel. 2. In the Apps for Office section, select an individual category or click All; or enter an Add-In type in the Search box.