Move vertices in Zbrush retopo

Kingblue

I've seen posts where it's said that there is no solution to this problem.
I want to move vertices on my retopo mesh, with them being constrained to the original hi-poly model. They actually fly away in the outer space. Does anybody found a wayout to this?

cryrid

What technique are you using, exactly? You can pull a vertex off of the model if you drag it away from the model and onto the document, but if you're moving it in a manner where it is over top of the model then it is going to be constrained to the mesh it is rigged to.

Kingblue

When I enter move mode, vertices don't costrain to the model.