Forms :: Navigation Form - Using DB Forms Under Its Subform Control

I am attempting to create a Navigation Form to allow another computer in my network to be able to utilize necessary forms within a database (through RunTime). I was hoping this would be a clean task by simply loading the forms into the tabs of the Navigation Form, however that is clearly not the case.

For starters, When attempting to use a form that has some VBA behind it (Docmd.ApplyFilter based on a selection from a combo box), I am given the error stating: "The action or method is invalid because the form or report isn't bound to a table or query."

After searching on this error, I believe it's because my Navigation Form does not have a record source. If this is the case, then I am confused as to what record source it should have, as with the 3 forms I need to access through the Navigation Form all pull data between various tables and queries within the database (some not related).

Now I've also come to the conclusion that my VBA references now must change in order to correctly use my forms. A correct reference would look something like:[Forms]![Navigation Form]![NavigationSubform].[Form].[My Form's Control]..Is this necessary in order to write any events, such as an AfterUpdate on a combo box?