Folders allow you to add another layer of access/restriction to records such as leads, contacts, companies, conversations, and opportunities.
NOTE: Until you choose a folder for the records, they will remain in a hidden public folder, which makes them visible to all users based on security group rights alone.
From Transaction Preferences, you can choose which features to allow the use of folders.
From your security group rights, you can choose from a variety of ways to allow users to edit the folders of each section.
NOTE: If you are an administrator, then you can access and set up folders regardless of your security group rights.
From any section of the system, you can set up and maintain the folders by selecting More > Manage Folders.
From here you can add new folders or edit existing ones.
You can choose what groups have the view or add rights to records in that folder.
Assign record to a folder
For each record, you can choose which folder it's assigned to.
Mass assign records to a folder
From the View of the records, check the box next to each record. Then click Update Fields. Check the box for folder and then choose the folder name from the drop-down.
With everything set up, your users should now only be able to access records that are in the folders they have access to.
Additionally, you can add the folder name to your custom reports to group or filter by.