Hello everyone, i have a question
when i watched Hard surface techniques 2(Eat 3d), i found that Mike’s model has something like mask on it
And when he sculpt the armor on that masked model, he didn’t affect the model.But i can’t sculpt on the mask surface.
(he used Clay brush)
How can i do that
try holding the ctrl key 
No, not mask a model
I mean i have a mesh and i want to sculpt it without damage its base form (Even i use Dam-standard brush)
It should look like this
see, his model have something like mask on it
Thanks for reply
that is a duplicate of his model as another subtool.
tool.subtool.duplicate