If the data is all in one table, then you don't want to use subforms on the
tabs.  You would probably end up with record-locking conflicts.

You do want to use a tab control to group the data into screens

Your current problem is that your have no controls on tab 1, they are on the
main form.  SELECT all the controls that you see when you are viewing tab 1.

Cut them,
click on the tab 1 header
You should see 6 handles appear in the tab control (6 small squares)
Paste the controls you have cut.   They should now be on page 1 of the tab
control
Flip to page 2 of the tab and check.

The trick is to make sure atab page has the focus when you add controls.  If
you don't, then the controls get added to the form instead of to the tab
control on the form.