No Copy controls between cash OBD to cash Invoice

Dear Gurus,

I am doing Cash sales.

Sales order: ZOBV

OBD: ZDBV

Invoice: ZBBV

In Delivery copy controls, I could link ZOBV to ZDBV, but in Billing copy controls I am not finding my OBD to Invoice copy controls. So I wanted to copy BV to BV and change it to ZDBV to ZBBV. Since there is no BV to BV copy control existing, I want to copy normal LF to F2 and change it to ZDBV to ZBBV.

Is this OK / correct??

If not how should my copy controls be??

Plz help me out here.

Thanks and regards with rewards.

Venkat - Hyd