Is there a way to not affect non manifold edges by sculpt bruhes.? I have a big landscape modell (golf course) with an lot of non-manifold edges (everytime when a lawn is next to a hard surface). Now - i want to sculpt the greens, roughs, bunkers and so on. but when i come near or over an non manifold edge it is moved away from its original positon - 

is there a way to avoid this?
I'd try adding those vertices to a vertex group and then using a mask modifier with this group as the modifiers target.