Add a Package then an Add-on Show and get a discount on both?

Hello!

I think this might be too complicated.  But we are looking at a pricing rule where if someone adds a fixed package to their cart.  They are prompted to add-on our annual Holiday show.  Once the patron adds the Holiday show to the cart, the pricing rule would apply a 30% discount to both the package and the add-on.   

Using the Add-On Type, I can discount either the package or the Holiday show. But I can't figure out how to apply the discount to both.  I think it might be too complex, but was hoping maybe someone else has done something similar?

Thanks!
Kristine