Yes, to do this you have a couple of options.

Discount Codes

You could use the discount code bolt-on to create a fixed amount or percentage off discount code that can only be used with the second class in a series. Participants booking their second class would then enter the code at booking.

Bundles

You could create a 2 class credit bundle and by giving the back-to-back classes and the related bundle a unique tag you can ensure that the bundle/offer can only be used with those classes.

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