Am trying to add a column to a custom BOM that is calculated based on an Assy custom property.  As back ground, we have a custom BOM that is loaded onto a sheet in the assembly drawing that serves as a tooling build release document.  It displays the part number, description and qty to be manufactured.  This quantity though should be calculated as "quantity per assy" x "number of assemblies to build".  Ihave a custom property in the assy model file which is "Assy Release Qty".  When adding a new column to this BOM, when I go to enter an equation, under custom properties, the drop down shows properties from the part files,  not from the assembly.  Is there a way of accessing the assy custom properties?