Moving prefab relative to one element inside it

Hello Unity Answers! I would like to ask a simple (or maybe not) question.

I have a prefab and inside this prefab, I have a little cube (Named "Start")

I would like to move this little cube to a specific position (in the "world space", not a prefab one) and make the rest of the whole prefab "follow" it.

I hope everything is clear, thanks for the help!