The process is similar to the creation of option 2 audits, as seen here in the relevant recordings.
Therefore, in this scenario as well, you need to create a parent site "PG/Multisite scope information (Site)" and assign all products of the option 1 multisite with QMS to this parent site.
When creating the Certification Scope work order, you need to select the reporting option "Option 1 - Certification Scope Management multisite with QMS" as seen here:
The QMS audit work order needs to be created by selecting the reporting option "Option 1 multisite with QMS", as seen here:
The site sampling audit work orders need to be created by selecting the reporting option "Option 1 - Site of Multisite with QMS":
