It is possible to limit group access to specific data using attributes, group association and security policies. You can find a configuration example at the following video: Modify Security Policy to have Classified Project
Solution:
1. Create a system group and add the users to it
2. Create a list attribute containing the all system group names
3. Add the attribute as a field to the notebook and/or experiment template(s) and make it a required field
4. Go to 'Group Associations' and link the attribute values to each group
5. Add the security policies to grant access to the group according to your needs
Rule Example:
RULE "Group Access"
IF attribute "Group" match
THEN grant "entity.read"