Hi Mastan,
To check component's usage in BOM use CS15 transaction. Production storage location is applied at plant level, so in MM17, select MARC and execute. Enter your material number and plant and execute. Click "Select Field" button at the top-left and select the field to be changed.
To extend the MRP views in material master, it is safe to put ND and external procurement type. Availability checking group is not relevant for this case.
Regards,
Julian