how do I associate price with a field?

I am building an enrollment application with several plan options.  I don't know how to add the price to the selection so it carries forward to payment.  Please advise.

I understand that you want to add the price to the plans available. You can achieve this by integrating one of the payment gateways.

I request you to go through the document Setting-Up-Your-First-Order-Form that helps you in payment integration. I hope this answers your enquiry. Please get back to us if you need further assistance. We are happy to assist you.