On the A.50.02 Tables screen, you define a master link table and link other (detail) tables to it.
In the first (Table Types) block, query for the COMMATTR type.
In the second (Table Names) block, type the name of the master link table in the Name field, and the table description in the Short Desc and Description fields.
Click Save, and click Next Block to open window 2 where you assign (link) detail tables to the master table.
If the detail tables do not exist, create them in the same way as described for the master table.
On Window 2, type a unique sequence number in the Seq field, and select the detail table from the list in the Tablename field. Do this for all tables you want to link to the master table, then click Save.