To create a subtype:
From the SAP menu, choose Tools Business Framework BAPI Development Business Object Builder , or enter the transaction code SWO1 .
In the field Object Type enter the name of the subtype you want to create, and choose Create .
In the next dialog box, enter the required details:
In the field Supertype , enter the name of the object type for which you want to create a subtype.
In the field Object Type , enter the name of the subtype you want to create.
Enter appropriate information in the remaining fields.