Where to Change the Receipt Routing of Whole PO(for all PO lines) in PO at once

Dear All

The receipt routing for the organization is Inspection & and I don't want to change that to Direct.

However, for a specific purchase order with 25 lines, I want to set the receipt routing to "Direct" for all lines at once, instead of updating each line individually in the shipment.

Where can I do this?

Please help

Thanks