While it is certainly possible for you to add more part mappings to your generated file, our recommendation would be to have them create a separate file for these additional mappings.

This would make it easier to:

1. Diagnose any mappings that fail to import

2. Clearly track and maintain these additional mappings in the future

On the PartFinder end, you can either add these one by one or upload a bulk import file. These links should be helpful to guide you through the process.