@nickm I don't think is possible which make sense: • A Subsidiary is a Legal Entity • A Location is a separate/individual Cost Center. Locations have a 1 to 1 relationship with subsidiaries. This would possibly work if Subsidiary AB is parent of Subsidiary CD and Location WX is tied to Subsidiary AB, Location XY is tied to Subsidiary CD. • A Sales Order created in Subsidiary CD should be able to deduct or use Items from Locations WX. • A Sales Order created in Subsidiary AB should be able to also deduct or use Items from Location WX.

Cross subsidiary fulfillment does exactly this - the "header" location remains the "billing location"/cost center, but you can assign Inventory Location at the line level to any location within that sub OR a location that has an inter sub relationship set up.