Hi ☒ , I’m not sure exactly what you mean by “seat” here.

You can share your data room with differing permissions available in the data room settings, in the top right corner. You can allow all, or limit to specific people /funnel stage. If you select the latter two, people will need to enter an email address of the matching person to view the data room.

If you’re referring to inviting teammates to your hub account, you can do that under settings in the left nav, bottom left.