Add Multiple Existing Clients to a Service

[IFPHA-Keith]

A user has requested the ability to add multiple existing clients to a Service, en masse. As it currently is, to add multiple existing clients to a Service, it has to be done one at a time. It would be preferable if there were a choice to add more than one (possibly with a check box) at a time. As we continue to use the tool and grow our usage of the tool, this is likely to become a more and more needed feature.