Can I limit my custom profile fields to only display in Pressero admin > site user page?

PRESSERO > *Pressero FAQs
It is not possible to directly create custom profile fields to be used for internal purposes that will only display on the admin > site users page but not show on the create account form or in the customers profile area of the storefront when they log in. 
But, with a few site limitations it is possible to accomplish this with a workaround. 
  1. Create your custom profile field and enable it for the site
  2. Do not allow self sign-ups for the site
  3. Do not give your site users permission to "edit their own personal account info"
In this scenario, the custom profile field will be enabled for the sign up form, in the admin > site user area, and in the site users profile area of the storefront, but you will be hiding those pages/forms from your customers so they will not see them. 
For more information on these areas, refer to the following documentation pages: 
Create a custom profile field - Ch. 026b Custom Profile Fields
Enable a custom field for the site - Ch. 046b Profile Fields
Disable ability to have users self sign up - Ch. 030. Site Basics
Set site user group to not allow editing of their own account information - Ch. 046 Creating Site Groups