Dont want to send form field values in Custom Submit action

@sb2512 :

as a first thing , if you dont want to send the field in the afdata, for those fields dont provide the bindRef  property to that filed.

if that doesnot work, try below.

In your custom submit component, if you have any clientlibs or in the rules editor  check that , if your submitting data with ajax call.

e.g:

$.ajax({
url: saveUrl,
type: 'POST',
data: formData,
contentType: 'application/json',
});

you might be having some logic to build the formdata which captures all the data which we input in the form. 

you can remove the keys which you dont want from the formData.