Hi @finance ,
I understand you're looking for a way to have users from three different teams collaborate on a single project without paying for extra seats.
Currently, having one project directly connect three teams isn't a feature we offer.
However, you might be interested in Connected Projects. This feature lets two separate teams work together in a shared project using billable seats from their own plans. Just keep in mind, there can only be one host and one external team per connected project.
For more information on how to use Connected Projects, you can check out this guide: Guide to connected projects
Thanks,