Hello Chandrakant,
You can refer the below link for more information related to Settype/Attributes:
In a nutshell, using settype/attributes you can create customer specific fileds and attach them
to category in txn COMM_HIERARCHY. When you create/use products with that category, then
Z-fields would be available for maintenance.
You can create attribute and settype using txn COMM_ATTRSET.
Let me know if you need any further details.
Best Regards,
Shanthala.