5.13.12.4 I Need to Apply Some Simple "Glue" Logic Between My Cores. How Do I Do That?

For basic inversion of pins, you can right-click a pin and choose Invert. An inverter will be placed at this pin when the design is generated. You can also right-click a pin and choose Tie Low or Tie High if you want to connect the pin to either GND or VCC.

To tie an input bus to a constant, right-click the bus and choose Tie to Constant. To mark an output pin as unused, right-click the pin and choose Mark as Unused.

To clear these, just right-click on the pin again and choose Clear Attribute.

My logic is a bit more complex than inversion and tie offs - what else can I do?

You have full access to the Microchip library macros, including AND, OR, and XOR logic functions. These are located in the Project Manager Catalog, listed under Actel Macros. Drag the logic function you want onto your SmartDesign Canvas.