I created a model with sculpt tool and I would like to make the retopology . However, after we did the Retopology, how can we make use of the details of High polygon model? ( sculpt model ) because the uv is from the different part .

Pls kindly advise. thank you!

I think what you want to do is bake a Normal map…

these are good free videos

Thank you Very Much I’ll Try it!!