I have a bunch of basic parts in our part library which I need to add the property MASS to the file properties on the Custom tab. The parts have existing properties such as MATERIAL, DESCRIPTION, etc. Currently I open each part and add MASS as Property Name and select Mass for Value / Text Expression which puts "SW-Mass@PartName.SLDPRT". Is there a way to add this property to a large quantity of parts? I have tried recording a macro, but it didn't record my inputs. I also looked into using the Property Tab Builder, but I don't want to lose existing properties that were already input.