You can disconnect a cross cloud tenant group by clearing the tenant group information from the B2C Commerce database.
As best practice, we recommend that the Salesforce org initiate the disconnect for the org. After the tenant group information is cleared, you can pair your B2C Commerce instance with another Salesforce tenant and include your instance in the tenant group owned by that Salesforce org.
If the Salesforce org isn’t available to initiate the disconnect, you can clear the target group information with the Disconnect option in Business Manager Cross Cloud Trust.
To view the cross-cloud tenant group settings: