Renewing a non-dues fee that was added outside of the membership fees
Non-dues subscription products can be purchased outside of the membership renewal process either by staff users on behalf of members, or by members themselves when non-dues billing cycles are offered through a public website.
Staff purchases on behalf of a member
As a staff user, if you know a member wishes to add an additional subscription product after (or before) renewal, you can manually add the new product to their account, so that they will be charged for the product when their renewal is generated. Subscription products added through this method are automatically included in the member's next renewal invoice. See Adding subscription items to member's accounts before generating renewals for full details.
Members purchase non-dues products through non-dues billing cycles offered on public website
Subscription products added through this method are automatically included in the member's next renewal invoice only if the additional subscription product is included in the membership billing cycle. The additional product does not have to coincide with the original term, because iMIS knows to sync the dates along with the products billed as part of the billing cycle.
If the additional product is not included in the billing cycle, it will not get picked up in the next renewal. Instead, it should be renewed by going to the content offering it for purchase and purchasing it again. Alternatively, you could also generate the non-dues billing cycle and send the member the associated invoice.
If you want to keep the additional product on its own billing period for the next billing run, then you will want to generate the non-dues cycle renewal based on the non-dues billing term.