As far as the double dagger. Big Rock, this is not something I have thought about much, either. According to Sec 0 a circiut feeding a sub-panel is a "Feeder" (services and branch circiuts are also defined). Sub-service is not defined in Sec. 0.
If the definition of "sub-service" includes "feeders", then the answer to Sam-rock's question is "Yes", provided you follow table 19
