Builtin templates

Hi all,
I’m working on upgrading from 4.6 to 6.1. The upgrade document has the following line “If you have flow services that have built-in 4.x templates (that is, templates that are stored in the pipeline rather than in the template manager)…”

I have only worked with FF schemas. Can someone please tell me how to identify the built-in templates in a project?

Thanks,
NK