I have been asked several times if there is a quick way of populating custom properties into drawings, parts, and assemblies outside of using a data management system. Solidworks has created a custom property builder to speed up the process. You can create a drop down list for any custom property so that it can be easily selected.
The problem is that when you save the property template out it only allows you to save this for a part file
To save these templates for drawings and assemblies first you must save it as a part template (.prtprp), then you can rename the extension to .asmprp for assemblies .drwprp for drawings. For step by step instructions on how to use and create the template please refer to the solidworks help menu.