If you want to see what members match a given target, you can create a Member Group around that target. Custom Targets are listed by Name in the User Settings filter for your members (under More Filter Options). Once you add a filter for your members, you can select your values and save your search as a Member Group. Since Member Groups are dynamically built, any member who adds the targets for your Member Group will automatically be added to the group, and can then be targeted for Broadcasts or other content.
For more information on how to create a Member Group, see Member Groups.