You can modify a minischema by adding tables to it from a physical source.
You can follow the dialog box-based procedure in Adding or Removing Tables in a Minischema or use the process below.
To add tables to a minischema:
If not already opened, open the minischema (see Opening a Minischema).
In the Data Source Navigator,under the data source connection name, select the table you want to add and drag it into the minischema work area.
A join will be made automatically if it is present in the physical data source.
Repeat step 2 for all physical tables that you want to add to the minischema.
To save your changes, right-click in the minischema work area and select Save Minischema.