Explanation
To give users in the partner user role access to all Case and Container records owned by any user at the same distributor, an Architect can give super user permission to the individual partner users. Super user permission allows partner users to access data owned by other partner users belonging to the same account or below them in the role hierarchy. Creating an ownership-based sharing rule will not work, as it will share records based on the owner's role or territory, not their account. Creating sharing sets will not work, as they are only available for Customer Community licenses, not Partner Community licenses. Creating a Permission Set granting "View All" permission to Case and Container records will not work, as it will give access to all records in those objects, regardless of their owner or account.