Set quantity shipped to zero on every shipment line.

Thanks Jay,this was was working perfectly(Back-ordered) but was subjected to manipulation. Is there a way then I can give rights to billing customers to just ship the orders but can not set the quantity to zero? Only another person with higher authority?

Yes

Please assist . I cannot see that option here. What I think I can, is to totally deny the billing group a right to edit the shipment but this means they cannot create an invoice later

You can remove shipment edit rights, then they have to post the invoice from the invoice UI.

Looks like this can work.

I will test and give you feedback. Thanks.