How do I add a 'custom amount' section in a paypal form where they can choose one donation level from several options or enter a custom amount

How do I add a 'custom amount' section in a paypal form where they can choose one donation level from several options or enter a custom amount 

Hi,

Yes it is possible to achieve your requirement. Here are the steps you should follow:

#1. Instead of displaying the donation options in the PayPal question, you can add the products in a check box question.

#2. Add a text box to collect the specific donation amount or "Allow Other" option for the checkbox field.. 

#3. Add a "Form Calculation" widget in your form to calculate the total amount of membership and donation.

http://www.jotform.com/help/301-How-to-Assign-Calculation-Value

http://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

#4. Add PayPal payment question in your form and set it to read the amount from the calculation widget. The following guide should help you how to pass calculation to PayPal payment question:  http://www.jotform.com/help/275-How-to-pass-a-calculation-to-a-payment-field 

Please check the screenshot below for all the steps:

 

Hope this helps.

Do get back to us if you have any questions.