This might work... Change the value of the one resistor back to 150 ohms (or revert to your original file for best results). Now <right-click> to edit the attributes and change the value from 150 to the 100. Before you hit 'okay' select the radio button next to 'apply update to all parts of this type'. That typically searches through every page of the schematic and updates all parts with matching parameters; will it work for a hierarchy?
If that doesn't work then I don't know of a way. I gave up on hierarchial files in PADS Logic about six years ago as I was very disappointed in the performance. I've heard that DxD is better for hierarchies.