Thanks for all your help
This is what I want to achieve
We have four identical forms on our present website which we are migrating to kentico(SharePoint)
Each form have an editable field that an editor adds a reference to which is not visible to external user.
I compare this forms to an alternative form in kentico.
I created the alternative forms in kentico, so that whenever he adds one of the forms to the page he can edit the form webpart properties and add the reference field, the value is passed into a field on the alternate form before saving the form.