Purchase Order App: How to add more than one shipping option?

and if I have more than one shipping option, how do I add more than one , so they can choose which one they want?

Shipping can be currently configured per total or per product, for each product it supports to set up shipping to the first product and additional ones. Please kindly refer to this guide to get more information about how to set the shipping cost to your form: https://www.jotform.com/help/304-How-to-Add-Shipping-Cost-to-Payment-Forms 

You may also provide us an example about what you would like to achieve in case this is not covered, we will be happy to further assist.