Add-On to Service While Booking?

[marissa_revival]

Hello! I own a wellness studio with 7 different wellness sessions. You can 'stack' some sessions together and I want to give my clients the option to 'add-on' during the booking process. For example, if they book a Compression Session, I want to offer an 'add-on' of a NanoVi or NuCalm session. These themselves are standalone sessions but I'm thinking it might increase sales if they are prompted to book something additional at checkout. Is this something that is possible with Square's current capabilities? Is there a way for them to see other available options so they can select multiple sessions?