The short answer to your question is - No.
You can assign only a single SmartRF Policy to an RF-Domain.
You can obviously configure the APs with the different static power levels - but that's not SmartRF of course.
What it sounds like you might be able to use though is the "Areas" and "Floors" functionality that is part of SmartRF.
This function allows you to essentially assign APs to an Area or a Floor such that SmartRF treats it differently from APs is other Areas or Floors or non-Areas/Floors. The easiest example to give for having this functionality is for buildings with multiple floors and having undesired signal bleed-through between Floors. The bleed-through can cause SmartRF to adjust the power downwards because it's seeing too much signal from adjacent floors. But if you assign the APs from each floor to their own 'Floor', then SmartRF functions such that it treats those APs on the floor as if they were their own separate SmartRF 'group'.
Now...this still doesn't let you create a different power range for these different groupings, but it will then let SmartRF possible RAISE or LOWER the power to levels that it previously would not have w/o using this functionality.
Check out
THIS article on configuring it.