I have one question for Mac users, since i'm only on Windows

I have Mac book laptop from my friend.
Inside it's an 750gb hard disk.
I'd like to upgrade this computer to ssd drive and more RAM.
Now, the easiest way would be to clone disk to disk.
I have Inateck station for doing offline cloning.
Now, here's my question.
In laptop , there's 750gb disk and 100gb is used.
I will add 256gb ssd into laptop.
I really don't want to install everything from scratch, but maybe try cloning first.
But, since laptop's disk is 750gb and i will have 256gb, is there a way to shrink 750gb to 256, since just 100gb is used and then try cloning.
So the device recognize just 256gb and not 750gb ?
Thanks