Create a Custom Tab in Excel
Use customizations to personalize the ribbon the way that you want it. For example, you can create custom tabs and custom groups to contain your frequently used commands.
IMPORTANT: Ribbon customization is specific to the Microsoft Office program you are working in at the time. Ribbon customization does not apply across the Office programs.
You can rename and change the order of the default tabs and groups that are built-into Microsoft Office 2010. However, you cannot rename the default commands, change the icons associated with these default commands, or change the order of these commands. The default commands appear in gray text.
To add commands to a group, you must add a custom group to a default tab or to a new, custom tab. To help you identify a custom tab or group and to distinguish from a default tab or group, the custom tabs and groups in the Customize the Ribbon list have (Custom) after the name, but the word (Custom) does not appear in the ribbon.
1. Default tab and group that has commands that cannot be changed
2. Custom group in a default tab that has new commands added. These new commands can be changed.
The video has been made by me and the text has been taken from microsoft blog