Unlocking Ticket Price in TNEW

Hello all!

I am trying to set up a pricing rule that does the following in TNEW:

Standard price type is already available on TNEW

Patron enters promo code

Promo code unlocks Special price type while also still having standard price type available

So basically, I want to set up a pricing rule so that when a promo code is entered, the patron has the option to purchase the new price type AND the standard price type, instead of having the standard price type change into the special price type.

Is this possible? I thought I had accidentally done this while setting up a different pricing rule but can't seem to replicate it.

Thanks for your ideas!