To give a group of users access to a Financial Deal, you need to share a financial deal record with a group by adding them as participants to the record from the Financial Deal Participants related list. The Financial Deal Participants related list is a custom related list on the Financial Deal object that allows you to add users, groups, or queues as participants of a financial deal. Participants can have different roles and access levels for a financial deal, such as Owner, Collaborator, Viewer, or Approver. By adding a group as a participant, you can grant access to all the members of that group for a specific financial deal. Verified Reference: : Salesforce Help Article [6] : Salesforce Help Article [7]