How to create a donation form with different categories of custom amount

A DONATION FORM THAT WILL BE CONNECTED TO AUTHORIZE.NET BECAUSE I HAVE AN ACCOUNT WITH THEM BUT THE FORM WOULD NEED TO BE SIMILIAR TO THIS 

Hi,

Yes, that's possible with the help of form calculation widget. https://www.jotform.com/help/259-How-to-perform-calculation-in-the-form

You can then pass the total value to the Authorize.net donation field. https://www.jotform.com/help/275-How-to-pass-a-calculation-to-a-payment-field

I have created you a working sample. http://form.jotformpro.com/form/42674685678979?

You can clone and use this form if you want. https://www.jotform.com/help/28-Cloning-a-Form-from-a-Web-Page

Make sure to configure your Authorize.net credentials on the payment wizard.

If you have further questions, let us know. Thanks!