I believe that with the revamp of the catalogue and spec builder - we should be able to assign the SHOP/FIELD property to a part family.
The reason for this is that while you can assign the component categories broadly (elbows = SHOP, valves = field), there are many many occasions where you may need to override that (BW elbows = SHOP, THDF elbows = FIELD). Currently the only way to do this is in the spec itself, which presents a risk that it will be missed since the same part could end up in multiple specs.
Creating the custom property as stated in this article does not seem to work:
https://forums.autodesk.com/t5/autocad-plant-3d-forum/shop-field-default-value/td-p/4547663
Can this please be included in the future as a feature in catalogue/spec builder?