Hi everyone, adding some additional context here, but as @lpb said, it’s best to chat with Sales or Support directly since they can view your organization details and provide more specific information for your case. 
We are currently updating how membership and licensing work in Asana to improve collaboration between paid and free users. With these changes, you can now have both paid and free users working on the same projects within your organization. Essentially, you’ll set up a “container team”, which will be upgraded to your desired plan, and assign paid licenses to the users within that team.
Members of these container teams covered by the paid plan will have access to the plan’s paid features across all of Asana, including in free teams.
If you create projects in the free teams where both free and paid users (members of the paid container team) are members, the paid users will be able to use paid features in these projects, while free users will only have access to free features. Free users will still be able to trigger rules and access forms created by paid users, as these features depend on that ability, but won’t be able to create rules or forms. Other paid features like timeline and custom fields will be available only to paid users.
We don’t have a guide article for this updated functionality yet, because although this change is already available for all mixed organizations (organizations with a mix of paid and free teams) there’s still some work to be done. But we will add an article to our Help Center covering this topic as soon as everything is ready.
I hope this makes sense!