Exclude folder from BOM

Does anyone know how to, or if it is possible, to exclude an entire folder from an assembly BOM? When I simply select the parts/assemblies within the folder and choose to exclude from bom in the properties dialog, it does not propogate to parts within the assemblies. I'd like to just have a folder I can drop things into or be able to classify any folder as excluded from BOM.

Thanks,

SolidworksBill Of Materials