Components of Creo Parametric assemblies are represented in Windchill by CAD usage links which have attribute quantity.unit set to each. In some cases it is useful to have another quanitiy.unit, for example meter (for bars, rails, ...). It would be nice if we could to set designated parameters in Creo components, which are mapped in Windchill to quantity.amount and quantity.unit of CAD usage link. At the moment, such a mapping is not recognized by Windchill. It would also be helpful if these attributes are then mapped to the corresponding attributes of the part usage link through the build of WTParts.
Otherwise, the BOM of the WTPart must be corrected manually by deleting and reinserting such a component. Then, this BOM component is no longer associative to the CAD model, and always needs to be updated manually. No one wants to have this behavior.
The attached document explains the desired technique with some screen shots.
A similar behavor is already implemented for find number and line number as IBAs of CAD usage link, which are then mapped to attributes of the corresponding part usage link via preferences build.find.number.attribute and build.line.number.attribute. [Zemsky, Jeff: PTC Live Global: BOM and Configuration Management Best Practices, 2014-11-19]