Change Account from Vendor to Customer?

What is the process to change an account in Business Relations from vendor to customer or vice versa?

What is your recommendation?

You cannot, it is a fixed 1:1 relationship. If the BR is a vendor they will have a vendor record, if you need one for a customer you need to create a separate record.

What do i do about their history? if i create a new record i am going to lose history?

Yes, the history will relate to them being a vendor not a customer, or vice a versa.