Then why did you say (in #286172) that the plans should all be top-level plans?
If you look back at my original detailed post ( #286153) that is exactly what I did originally.
And I indicated that I needed to have the upgrade option between B1 and B2.
When I put B1 and B2 (exclusive) under D (non-exclusive), and I sign-up for A during registration, the only thing I can then add is C. D (or B1/B2) are no longer visible.
It would be helpful if you could just provide the proper configuration I would need to get this working (as there is no other documentation,tutorial, or anything that I could find via search on the forums to explain exactly how to get this working).
Are there some specific settings that I need to configure (other than 'non-exclusive') for D to make B1 and B2 show up as options later on?