The MWG integration with ePO allows you to manage lists, it does not allow for modify or constructing rules (those must be done in MWG itself).
However, once you have the rules built, you can just modify the lists from ePO as you see fit. The concept is that the rules wont need to change much once their built.
You should be able to access the lists under the Common Catalog section in ePO.
Once you create a catalog, you can create lists in the catalog, and they will be synced over to MWG. You might need to reload the policy from backend to get it to show up.
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