Right now, ER Modeler just support import a bunch of tables into its workspace by filter. and generate the relationship automatically. But in the real case not every relationship is defined by FK, in most case we need build such relationship automatically. ER Modeler supports add tables manually, but it's not convenient, we have add all the table's information manually.

The real case for me is in most case we just need to show/create the relationships among a group tables for demo.

It's better If ER Modeler can support drag & drop a group tables into workspace and populate all its information and existing relationship automatically, of course use can manual add/delete/modify the relationship.