Thanks Bek, is what I do, as you see first image and look at the edge loop you can see there is applied some edge loops where I want sharp edge. When apply some levels (or only one) subdivision and turn back to level 1 (or export level one) zbrush rounding all relaxing the edge loops. Neox, thanks for your advice, I will…
As far as I can tell you've maintained your edges when subdividing by adding supporting geo / edge loops. You'd probably be better defining your polygroups and using Crease.
Would it be easier to add more edge loops before exporting to zbrush then? Add more than necessary so when you subdivide with smt the smoothing effect won't be as great. Then you won't have to polygroup / crease. Whatever works faster for you I guess.
When you smooth in modo using Sub-D it doesn't actually change the un-smoothed geometry. Zbrush subdivisions actually change the geometry all through the subD levels. Ie if you sculpt a huge blob on your mesh at the highest subD level, and then progress down in levels, you'll see the lower levels 'update' to support this…