It's been a while since I've tackled this problem. Here is what is in the back of my mind. It sounds like you are using POWER pins for the symbol power which will automatically revert to global if not connected to a local net or global symbol. As you are aware, connecting the power to a global symbol promotes thru the h-block. This of course is very handy unless you don't want this... There is a special property that you can apply to symbols (and I *think* h-blocks) that allows you to change a POWER pin to another net without having to draw a net/global symbol on that pin. The property is called POWER_GROUP and it would normally have a value of "VCC=V_LOCAL_NAME_XXX" where VCC is the name of the pin on the symbol and V_LOCAL_NAME_XXX is the net you want it to be called at the global level. Let me know if you get this work or if you need help but I think it might address your question.
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