It is a little bit unclear to me what you’re asking for.
In an organization, logins don’t belong to different members, they belong to a “Collection”. Thus, you need to set up one or more Collections, and then transfer login items from your Individual vault into a Collection (if you wish to share those items), or create new login items in the Organization, and assign them to a Collection.
You can then modify the Collection Permissions to control which Organization members have access to what.