What should I use to do it?
This is all CFraming my friend, here;
-- Assuming we already have "torso" figured out. torso.CFrame = torso.CFrame * CFrame.new(0, 0, -5)
I didn't go to in depth in what this script does, but if you have any questions feel free to leave a comment.
Please make sure to upvote / accept if this helped you! :)