Create your dynamics 365 trial as a first step (if not already created)
Once trial is set up successfully, open the admin center for Dynamics 365 and select Applications and click on Manage to configure the portal.
Provide details for the portal
Click on Accept
Grant Permission to the Portal
We’d get the below message
After some time
Clicking on here takes us to the manage your solutions page
Once configured we’d see the following area\groups\sub groups added to site map specific to portals
Hope it helps..