akotronis,
I don't think what you are trying to do would be very difficult but it's hard to understand exactly what the issue is.
Do you have knowledge regarding vba and event procedures? If you do then it should be no problem. If you don't then it will be trickier but I still don't think it would be too difficult. I am new to access myself but have a fairly good understanding of vba and event procedures.
To sum up what you need to do.
1 - Add code to the event procedure in the field last field of the first page. This code will activate the next page and set the focus on the combo box.
2 - Add code to the change event procedure of the combo box. Actually probably the before update or after update. These are located in the event tab of the properties window. Assuming 2010 version.
You might be able to do with macros (not vba) but I don't know if you can enable / disable controls with macros.
Edit:
Step 1 - make sure you know where to put the code.
In design view, select the last field on page 1.
Then select the event tab in the properties sheet (probably far right, if not visible, right click form and select properties.
Then select the on key down field and click the button on the right (...)
Select cold builder and paste the following code into the procedure.
Go into form view, go to that field and press the tab key. You should get a popup that said you hit that key. It should only trigger if you are in that field.
If that works then all you need to do is replace the MsgBox statement with the code required to activate the next page and set the focus to the first field.
And repeat for each page.
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