I want to create a nintex form that will show the user only the fields where they need to enter data. However if an administrator or other named group wants to add a new item or edit an existing item, i want them to see all possible fields.
Place all the control for an Admin into a Panel control. Then, open the configuration of the Panel control and in the Appearance section, click on the drop down for Visible. You should see an option for Yes, No and Expression.
Choose expression and then click on the Inline Functions tab. You'll find a function called IsMemberOfGroup. You can use this like:
So what this means, is that the selected control will only be visible if the current user of a member of the Administrators group.