The system currently does not have the ability to create Phantom Packs for anything other than Customer Shipments. We have created Problem PRB0149356 to work on adding this functionality to the system but it has not been added at this time.
Workaround in Epicor Manifest
You can use the following method if you have Epicor Manifest.
Freight the shipment in Epicor… add all the parts you want.
Then go into Manifest, find the shipment
Un-ship it in Manifest, add the total number of boxes you want
Ship it in Manifest and copy the master tracking number and paste it over the tracking number in Epicor for the shipment you originally did.