More Advanced Setups.
Some clients want to make certain products 'appear' and 'disappear" from the membership invoice based on the selection of other products. This option is call "product select". The most common place this is used is with in the application of initiation fees. The example below allows the 'initiation fee' to appear only after the member has selected one of the 3 membership products. (and of course is in "offered membership" and is "unpaid')