What I think you want from your description is
Code:
Select Case .Range.Text
Case "MAPD"
If ActiveDocument.SelectContentControlsByTitle("Company").Item(1).Range.Text = "AARP" Then
'if MAPD and AARP, choices are object1, object2, object3
StrOut = "object1, object2, object3" '"q,w,e"
Else
StrOut = "item1, item2, item3"
'if MAPD and AETNA, choices are item1, item2, item3
End If
Case "Supplement"
StrOut = "1,2,3"
End Select
You might find
Insert Content Control Add-In useful for creating and editing your content controls.