How do I generate coupon code to waive off delivery charge or give discount?

I know i can generate coupon code when using the normal Purchase Order Shopping cart feature.

However in this case I am not using the normal Purchase Order shopping cart widget, how can i achieve the feature of coupon code to waive off delivery fees or give 10% discount code?

Yes, you can apply the coupon code to the total. You would have to perform the calculations in the Form Calculation widget:

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget 

Next, you can pass the total to the payment field: https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field 

Could you please confirm your requirements?

Do you want to give a 10% discount for all the users or based on special criteria?

Please confirm your requirement.

Thansk.

I would like to give a 10% discount off the total amount when user key in the coupon that I send to them via email. For example : 10%OFFCODE

Another scenario which I am thinking of is to waive off the delivery fees that was imposed to them when they key a specific coupon, for example: FREEDELIVERY

You would need to add a Short Text Entry field which you can name as "Coupon code", a new Form Calculation widget which you can name as "Discount total".

Then, create a condition to calculate the discount, example:

Finally, add a new Form Calculation widget, this should be the one that has the total amount to be paid(Total Amount - Discount Total), so you can do this calculation:

If you will waive off the delivery fee, you just need to create a new condition to calculate the total to be discounted based on the code entered.

Let us know if you need more help.