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Main outdoor breaker is ONLY 100 AMP but total of Breakers AMP on internal panel is 165 AMPs. From what I have read so far this still ok. I could have Subpanels/Feeder Panels down stream from the main breaker requesting more output but if the Main is unable to handle it then it should "flip off" correct?

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Synopsis: The sum of all the branch circuit breakers is a meaningless number.

The main breaker will "trip", or "flip off" as you say, when the current (amperage) load well exceeds it's rating for a predetermined amount of time. Meaning a breaker does not trip when the load is 1 or 2 more than the rating. The "continuous load" on the panel should not exceed 80%. In a residential application this is a hard number to pin down though.

As to your sub-panel question, a load calculation is the only accurate way to tell if your service is adequate to support any new loads on the service.

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