Hello Wp59, welcome to the forum, and congrats on your MP7SE!
First, there is no "copy and paste" functionality (in the traditional sense) in the MP instruments, however there are some methods that can achieve similar results.
1. Eff.SW setting in SYSTEM:Utility
This setting defines whether or not EFX/AMP/Reverb settings are changed when alternating between different SETUPs. Using this setting, it is possible to copy EFX/AMP/Reverb settings to multiple sounds, as explained on p.106
of the owner's manual.
2. Store to SOUND memory first
SOUND memories can memorise most of the zone's parameters (except [C]ommon parameters and a part of KeySetup parameters). Therefore, if you wish to reuse the same modified SOUND in multiple SETUPS, it should be possible to make the desired changes to a SOUND, store them to memory, then assign this modified SOUND to the desire ZONE of a SETUP. However, please bear in mind that the SUB1/2/3 have different EFX capabilities to the MAIN zone, so if a SOUND is prepared for the MAIN zone using EFX that are only accessible for that zone, assigning it a SUB1/2/3 zone may result in a slightly different sound (due to fallback EFX being used)
3. Store ONE SOUND memory to USB stick, then reload
I have not tried this myself, but I believe it should be possible adjust a SOUND, save it as a ONE SOUND file to USB memory, then reload into another SETUP memory.
4. SETUP memory copy
It's also possible to "copy" complete SETUP memories by using the STORE function and simply changing the memory position to store the SETUP to. This will essentially give you a backup of the current instrument configuration, which can be used as a base to make further changes.
I hope this helps.