I think it all depends on exactly how the relationships are set up, and how you set up the GTRR. "No Related Tables" would seem to point to a missing or incorrect relationship set up.
Can you post a pic of your Relationships tab in Manage Database, and may a pic or description of the relationships?
Thanks. The Admin table is not really used for anything. Currently it hold loads of Global fields for the various icons (so I can change them globally throughout all layouts). To get it to display the Purchase Orders, I haste a Global Field called Dashboard_PurchaseOrders and it contains the value Open. I then have a relationship linking this to Purchase_Status. The idea being that I can then have a portal showing all Open Purchase orders.
Then you should be able to set up a portal to PurchaseOrders_DashboardOpen from a layout based on Srvr_Admin 2.