Where do the additional services that are added to GBP service listings under each category come from?

[NickB-Tampa]

Google states "other sources" but what are they?

Also, is it better to add service categories by selecting them within the services area and then adding multiple service offerings into them individually or just add them to the categories area directly?

 

[ElizabethRule]

A lot of the time Google pulls this info directly from the business website. Here is an article that explains it well => Google Scraping Website Content to Add New Services in GMB