Creating a folder structure for tabs in Microsoft Excel

1. Right-click on any of the existing tabs at the bottom of the workbook and select "New Group" from the context menu.
2. A new group tab will appear at the bottom of the workbook. Right-click on it and select "Rename" to give it a name, such as "Alphabet".
3. Drag and drop the tabs that you want to group under the "Alphabet" tab.
4. Repeat steps 1-3 to create additional group tabs, such as "Numbers", and move the corresponding tabs under them.
5. To collapse a group, simply click on the arrow icon next to the group name. To expand it, click on the arrow again.

That's it! Now you have a folder structure for your tabs in the workbook, which allows you to easily organize and navigate through them.