Benzos aren't like norcos but combining them gets a stronger effect . It isn't really that pleasurable to be real, and it's very very dangerous especially people with no tolerance trying to mix the two ( opiates and benzos.) I find it kills my opiate euphoria and I am left with intense benzo feeling and sedation and general " downer" effect. But the good part of the opiate high is diminished by he benzos. They dumb down the whole thing and honestly can kill when mixed. It's a huge killer of people in the U.S. Who dies from prescription drugs. The combo dosage of benzo and opioid may even be the number one killer of those who did by prescription meds, Od or otherwise.
But yea if u must do less of either one than u would do if it was not in combo. If u take 20mg hydro normally , and ur starter Xanax dose is.5 mg by themselves then do 5-10 mg hydro and .25 mg Xanax. But try each on their own first before conniving and please actually don't even bother that's really the best answer because it's so dangerous and is a good way to get hooked on two very powerful and dependence-causing drugs which nobody ever wants . Be safe , good luck.