In case of an option 1 multisite, do I need to create e.g. all 3 sites? Then I would need to create and add a product for each site, right? And finally I add all to the Scope information?

Yes, that is correct. In this instance, all three sites must be created, and the corresponding product(s) for each site must be created and appropriately assigned to their respective locations.

During the preparation of the Certification Scope work order, all products have to be added to the certification scope.

Please note that, depending on whether the Option 1 multisite producer is operating a QMS or not, the applicable certification option shall be selected (Option 1 multisite with or without QMS).