"Freeze" audio

I have some vocals that I have moved without the “grid” activated so it was a bit wrong in tempo, now I have moved it so its OK, but how do I get it to “stick” to the grid? So I can move it in the future without getting it wrong in tempo again? I mean if I have the “grid” acivated?

Either crop the part so its start matches the grid or:
Open the part window. On the left there’s a small “R” vertically centered. This is the point that the grid snaps to and you can freely move it to any other place of your part