The window that appears when you click
Copy Appointment Periods has the ability to delete existing appointment periods (as long as they don't have appointments) and then create new ones. It works like this - if the
Copy To Dispatch Group has appointment periods in the
Copy To period, the system will ask if you want to delete them and then create fresh appointment periods. Please follow the instructions described under
How To Copy Appointment Periods for a description of the
Copy Appointment Periods functionality.