Hi there!
If I understand your situation correctly, you are trying to set up tickets that share capacity where one is a paid ticket and one is a free ticket? This should be possible using the process outlined here:?https://theeventscalendar.com/knowledgebase/k/making-tickets/#global-stock?– you would just have to make the price for one of the tickets 0 or “free”, which you would need WooCommerce to achieve (Stripe and PayPal do not allow for a price of 0).
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As it stands, RSVPs do not support the shared capacity feature. If you are trying to set up shared capacity between an RSVP (not a free ticket) and a ticket, unfortunately, that is not something we currently support.?
This is also a great idea, so if this is something you would like to see in a future release, please submit a feature request on our Ideas page.?