We are trying to run a BOGO sale via scripts on available to items only in a specific collection. We would not like to have promo codes able to be applied to the BOGO pairs, but do want to let them apply to items outside the collection or, for instance, if they bought just one item from the BOGO collection. Can anyone provide any assistance? I have scripts for BOGO on all items and automatic discounts, but do not have enough experience to write what we're trying to accomplish. Thanks!