Power Store does not support this type of cross selling.
it would require custom coding that we do not offer support for in the forums, we can help you add this through our Premiere Support service which is a one on one session with one of our engineers where we will help you implement custom functionality. Premiere support is $99 / 30 minutes, it shouldn't take more than an hour to implement this for you.
visit the support landing page for details on signing up for a premiere support appointment.