P13714 - Sub account Field

Folks,

Has anyone found any novel ways of getting this populated automatically? Something like an equipment to WO cat code map would be ideal only populating the Sub field not a WO Cat Code. The only way I've seen this done is by way of a mod to P13714 to read Cat Code "XYZ" in the Equipment master and store that value in the P13714 of the WO Sub field. Is there any vanilla way to get that Sub field populated with a value that is dependent on the equipment selected on the WO? In other words the Sub field value