I am very new to Nintex workflows, so I have a dumb question. I am creating a workflow for a SharePoint list, and can't seem to figure something out. Is it possible to use a variable created within the workflow, in a condition (within a "Set a condition" action)? I have two variables...the first is of type People or Group, and the second is Yes/No. I basically want to check to see if they have data, then perform some action, else perform another action. 

Is this possible using user workflow variables, or can this be done only with fields from the SharePoint list?