online subscription offer

We use TNEW, soon to be on v4, and we'd like to set up a promo code offer for online subscriptions of "Buy 3 packages, Get 1 free".  Any tips on how to set this up without customization?  This is our first year with online subscriptions so this is my first time creating an offer for packages.  Can one seat be a comp pricetype?  Can you deduct a bulk amount from the total due at checkout?  This would only be valid for 2 of our 4 packages.  I appreciate any help you can give!

 

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