Allow for existing clients in the system to be added to newly-created groups by highlighting multiple clients and having a tool which allows clients to be selected on an individual basis, but NOT adding them one at a time. For example, I have clients from a specific school which are more than a couple of years out. I have created a new group to market to and want to add individuals based on criteria I determine, NOT just adding an existing client group to a new group. To have to open each client individually to add them to the newly-created group is a nightmare and cumbersome given that this is database-driven software.