Dolby Dimension can store information for up to 8 Source Devices, meaning you can pair 8 source devices before an older paired device will get overwritten.  3 Source Devices can be mapped to the Source Buttons on the right earcup, and 1 Source can be actively connected at a time.  To connect to another of the 3 mapped sources, simply press the corresponding Source Button on the right earcup.  Once a device has been paired, there is no need to repeat the pairing process with that device again.