I have to ask the question of why it takes 8 forms to enter your data?
As to your problem, there are a couple of things I can suggest, one is a Mainform or Tabbed Mainform where the Primary Record controls all those on the Tabs or subforms via Master/Child links which is the correct way to control records.
Second providing the Forms are using the same recordset in the same order you can also use the Form's Bookmarks like this (which mimicks a split form).
If Me.ID <> Me.tblCustomer!ID Then
Me.tblCustomer.Form.Bookmark = Me.Bookmark
End If
and for subform
If Me.ID <> Me.Parent.ID Then
Me.Parent.Bookmark = Me.Bookmark
End If
You can also use VBA to control which record a form opens on when you open them, but it does filter the form.
ps you should also set the form "Cycle" property to "Current Record" which prevents tabbing or Return key presses taking you to the next record.