HI Psygorn,

re:
> Could you please explain to me How I can properly use this Creat under SubD tab?
> Why it seems as if it works in strange ways?

It's meant to convert a polygon mesh file that has been structured for sub-d smoothing.

If you get strange results it probably means the model you are trying to convert has not been modeled as a sub-d control cage.

You should see the same strange results if you imported the same file into a poly modeling program and then applied sub-d smoothing on it.

- Michael