If the audit report is used for an audit of various training sites of the same training provider and they all share the same QMS, can a single audit report be used for all?

Yes, it can be used. The following guidance is to be followed:

• In the cover page (Address): list the addresses of the various sites
• In Section 2 (Training modules recommended for certification): specify which modules are recommended for certification at each site
• In Section 5 (Training assessment): specify to what training site corresponds the module being assessed (the cell Recommendations can be used to clarify this)