How do you only implode a part and not change the score?

difficult for me to understand.....you want to keep you score after imploding just to see if the result is good ??? if that make a copy with another name to keep it....If I'm wrong, sorry....

You don't. Implode changes content and content is linked between part and score

Althouh.. you could have an single staff with multiple voices in the score, and only have one of those voices (visible) in a part.

Or you can make a copy of the score first, and then do the implode in the copy.