Hi Laura - let’s first make sure we’re on the same vernacular page. By “workspace table” do you actually mean a “base” that contains a table linking to another entirely different table in an entirely different base?
Note that workspaces contain bases; bases contain tables; tables contain records. As such, there isn’t really a concept in Airtable known as “workspace table”. In the following diagram, the red link lines are not possible as far as I know in the Airtable feature set. However, using the API, all link lines are possible.