The purpose of a custom group is to facilitate the deployment of a policy to a bunch of endpoints, where you can add multiple endpoints to a single custom group, thereby aiding the policy deployment management. Bulk deployment improves policy distribution to various endpoints across the network and reduces the time and effort spent on individual policy deployment.
With a sound policy in hand, it is only effective when such policy is deployed in bulk to a group of computers belonging to users, who require the same data classification and data loss prevention techniques.
There are two types of custom groups supported in Endpoint DLP Plus.