Hi @Pat G ,
As I understand your question, it sounds like you are trying to synchronize certain organizations to Entra/Azure within Personio.
While I am not familiar with Personio, I believe the scenario your options would be to use domain-based filtering or attribute-based filtering to only import certain users, since group-based filtering is apparently not supported for Personio. https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/how-to-connect-sync-configure-filtering
Otherwise you could consider using separate tenants to support each organization.
I would recommend to reach out to Personio support for further details though, as most of the documentation for this integration is on the Personio side and not within the Azure docs. https://support.personio.de/hc/en-us/articles/4408178008849-Microsoft-Entra-ID-formerly-Azure-Active-Directory