I've moved this post from the DxDesigner community to the I/O Designer community, where it will be more likely to be answered.
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The missing VCCBRAM and VCCBATT is a known defect and has already been fixed for the next release of IOD. For now you could create your signal as a type of VCCINT or OTHER, use Tools->TypeCompatibility to define that VCCINT or OTHER can be assigned to a VCCBRAM pin, and finally drag the signal onto the pin using the ctrl and shift keys. A tip is to select your VCCBRAM pins in the Pins list and then RMK->ShowOnlySelectedRows, this will make assigning easier.
Thanks for this response. I'll give it a whirl.