Symptoms
I have a K2 for SharePoint New Form which I need to be able to navigate back to the Root Site Collection List level when the form is submitted. There are parameters that hold some different parts of the URL, but I cannot find a way to get the Source/Base URL into a Navigate to a URL rule.
Diagnoses
There is an auto created expression and rule to help with this.
Resolution
The rule which contains the auto created navigate to list page is the Save button. When the save button is clicked, there is a Navigate to a URL rule which takes you back up to the portal page. It shows how to set up a navigation link to the base SharePoint site.
I also recommended using the Environment Fields to hold the base SharePoint URL as this can be changed per environment.