We often have many different types of constituents lists that we are combining to make one master list for the purpose of marketing. It would be helpful if we could use the Add/Remove feature to add more than one list at a time. Currently the interface allows you to believe you are adding more than one but can only add one at a time. Correcting this error to allow for multiple lists to be added at one time would be very helpful. See the support case below for a video of the error I was receiving when trying to add more than one list and the benefit of being able to add more than one.

Blackbaud Support Case 019242057: Defect with adding lists to existing list.