How to create new contact person and set as default in BP

Hi Experts,

I am using SAP SRM 7.01 and using classic scenario.

We create vendors initially from the portal. Once the vendor is created via portal, its BP number is generated along with Contact person. This vendor is also created in su01 and ppomv_bbp.

Now I need to change the contact person in Bp and set that contact person as default.

How can I create a new contact person in Bp?

Help is appreciated.

Regards,

Ankita Bhagat