Hey eddepet,
You can use the script I released here ; massive Attribute, just select all the polySmooth, find the subdivisionLevels object in the list and change the value will update on all the selection
Or you can simply use the script editor command, if all the smooth starts with the same name (which is probably the case) you can type something like this (in a new Python tab inside the script Editor);
from maya import cmds
SMOOTH_VALUE = 2.0 # here you define the amount of subdivision
smooths = cmds.ls('polySmoothFace*')
for sm in smooths:cmds.setAttr('%s.subdivisionLevels' % sm, SMOOTH_VALUE)
Have a nice day,
Mehdi