The issue that I have is 3 Oracle databases and 2 Designer implementations and I need to verify the appropriate design to database. I found out that you can only import from Designer one time into the same Relational Model because that wizard does not allow you to pick the relational or physical model. I prefer to do a staged Import from Designer.
I found out that you can only import from Designer one time into the same Relational Model
It imports into "current" relational model. You can set one particular model as "current" one using "File>Export>DDL File" and select the model to be used in DDL generation.
However bear in mind imported objects have the same object ID as it is in Designer's repository - so if table is imported in one relational model then you'll have problem trying to import the same table into another relational model.
You can try to import to another design and later use "Tool>Compare/Merge models" to import relational model (or to another physical model).
For physical model - you also can use "clone physical model" functionality(clone, save, delete and again import ... )