Extending the Customer to a differant company Code

Dear All ,

I Need to Extend around 1000 Customers to a differant company code using the transaction BP in R3.

As there is huge amount of customers i am thinking of writing a program in ABAP . Can you please suggest me which BAPI to use for the same.

Also please suggest anyother comfortable way to do the same.

Please revert.Its very Urgent.

Regards,

Nikhil V. Joshi