Assign OBLPN to Outbound Load based on Route Number

In our business we have route information available at the Order header. Once OBLPN status become packed outbound load number is automatically assigned to order based on route information (feature available in the product).

Now there is a need for which we want to RePack the from OBLPN used for picking into several to OBLPN. We are planning to achieve repack process via webservice. Now after this we should assign all the OBLPN (to OBLPN) associated to a single route to one outbound load number.

For this we need to fetch all the OBLPN against one particular route and assign it to a single load number. How can this be achieved through web service.