Hi,
Delegation works as follows
SWO1 create subtype.
In your subtype add the attributes/methods/events that you want
Then change release status of components and the objects position the cursor and go to edit-->Change Release Status
Generate
Then go back to main screen of SWO1 and choose settings-->delegate.
There you type which business object should be delegated with your custom one.
Then whenever you or SAP accesses the original supertype BUSISB001 it will go to your ZBUSISB001 instead.
Kind regards, Rob Dielemans