For partial smoothing, simply select all the faces you want to smooth together scroll down in the editable poly/mesh tollbar to the smoothing groups (a big grid of numbers) and choose a number.
Usually you get the best results from NURMS ("non-unified rational meshsmooth")
Apply the Meshsmooth modifier and under 'method' choose 'NURMS'.
You can increase the number of iterations to achieve better smoothness.
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