Sure, I can help you with that! Here's how you can create tabs with sub tabs in Microsoft Excel:

1. First, create a new workbook in Excel and give it a name that reflects the category you want to organize. For example, if you want to organize different projects for a client, you could name the workbook "Client Projects."
   
2. Next, create a new worksheet by clicking on the plus sign (+) at the bottom of the screen. This will create a new tab at the bottom of the workbook.
   
3. Rename the new worksheet to reflect the specific job within the category. For example, if the category is "Client Projects" and the job is "Website Redesign," you could name the worksheet "Website Redesign."
   
4. Repeat steps 2 and 3 for each job within the category. This will create multiple sub tabs within the main category tab.
   
5. To move between the sub tabs, simply click on the tab at the bottom of the screen that corresponds to the job you want to work on.
   
6. You can also change the color of the tabs to make them easier to distinguish. To do this, right-click on the tab and select "Tab Color" from the drop-down menu. Choose a color that corresponds to the category or job.

That's it! You now have a workbook with tabs and sub tabs that will help you organize your data and projects. Let me know if you have any other questions or if there's anything else I can help you with.