Automatic pickup Billing Type in VF01

Dear experts,

Is there any option to automatic pick up of billing type STO delivery(NL).

I have created PO for STO and dilevery(Delivery type NL) through billing VF01, working fine but every time when i create vf01 billing is not coming automatically billing type i am selecting manually the billing type JEX

please suggest is there any user exit or any configuration is required for picking of billing type automatically.

useful answers duly rewarded