Cant find info

So my problem is that I am using mudbox for first time and cant figure out couple of things(yes I have read help and watched tutorials).

I have subdivided base head mesh 2 levels and added third level to eyes, mouth and eyers.
How do I bring rest of the head to 3 third level(if thats necessary) without artifacts and create displacment map for rendering.

Step down to level 2, select the other parts and subdivide again. There won't be creases, because when the displacement map is created everything will be subdivided to the highest level anyway.

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