You can run a finite element cool analysis on an existing a CAD/STL mold model. If you want to import a CAD/STL mold, make sure that the feed system and cooling channels have already been modelled, according to your CAD/STL design.
To import a CAD model, you will need Autodesk Simulation Moldflow Design Link 2015, or later, installed on your computer.
The first steps 1-4 will instruct you on how to import your model and feed system. Steps 5-7 apply to importing the mold. The same procedure applies to all the components you need to import.