[HELP] Offer engine - using multiple offer spaces in a delivery

I am using the offer engine to pull offers and offer spaces into my delivery.  However, i have a need to load multiple offer spaces in a single delivery (for example, both a header and body offer).  When setting up the offer in the delivery i only see the ability to pick a single offer space.  Does anyone know a way to use the offer engine and still leverage multiple spaces in a delivery?