I am looking to add a subpanel to my house outside and next to the main panel. The main panel is 150 amp and I was told that I can run a 100 amp breaker from my main into a 125 amp subpanel. I was told to take out the AC breaker from my main and put the 100 amp breaker into the slot and the run the 2\0 wire from the breaker into the sub. Then I would take the AC breaker and put it into the sub and then fill in the rest with the new wiring from the basement. I am running three different circuits in the basement and then one out to the garage. Does any of this sound right? Thanks from Colorado