A Tabbed Control is a great little device. There are just a couple of things you need to know to use them successfully.
Create a form in Design View if you haven't already done so. Goto the toolbox and click on the Tabbed Control icon; it actually looks like several manila file folders. Place it on your form and adjust the size to your liking. If you need more than the two tabbed pages it initially gives you, click on the tabbed control to select it. Goto Insert and click on Tabbed Control Page and another tabbed page will be added. Do this as many times as necessary.
This is the really important part: when you go to add a control (such as a Subform) to a tabbed page, you must first click to select one of the individual pages, then add the control. Otherwise, the control will be added to the form itself, and will show thru on all tabbed pages! If you have, indeed, selected an individual tabbed page, when you click on the control to be added and drag it over to the page, the middle of the page will turn black! You can now drop the control on the page. If you drag the control over the tabbed page and it doesn’t turn black, you’ve accidentally selected the entire Tabbed Control instead of an individual page, and must start all over again.
Good luck!