This method is perfect if you want to view other A-Support scenes of a character without ruining your preferred pair who you want to have a Paired Ending. As mentioned before, a character with multiple A-supports will have a chance to end up with one of those other characters whom he/she shared an A-Support level with.
When you do view a Support conversation, it is saved on the game’s archive/library once you saved your game, even if you overwrite that saved slot. You can view all Support Conversations you have unlocked from the main menu, under Extras. If you want to dictate your preferred paired endings between characters but still want to see/record their other A supports, you can do this trick.
1. You need two save files slots to do this: One as the main file where you’ll resume your normal progress, and one dummy file where you want to view the supports and will eventually overwrite later.
2. Just view all the supports you want then save on your dummy file.
3. Next, exit the game, relaunch it, then confirm by viewing if all your viewed conversations are now available in the extras.
4. Load your other “normal” saved file and continue the game as normal, without affecting your intended pairs’ A-Support. You can overwrite the dummy file with your normal progress and still keep the viewed A-supports in your archive. Rinse, repeat.