Good morning, on Work Order Completions - is it possible to have the GL impact's department post based on the Manufacturing Route vs. the item record?

All GL impact in NetSuite comes from the item record

Right. After some research, looks like a script will have to be written. We’re looking to set the department field based on the text value of the Manufacturing Routing field

Could the "Custom GL Lines Plug-in" be adapted to work in the Completion?

I think so. We do already have a few reclasses utilizing the Custom GL Lines Plug-in. Was looking to avoid another script being written