Well, it depends on where you want the variables to reside. The simplest is probably local variables. Click on the 'Variable' tab of the sequence window and under locals, you will see the text 'Right click to insert Local'. Do that and create a Boolean. When you add the LabVIEW step, click the 'f(x) and you get the Expression Browser window where you can browse to the local variables (or any other). While in the Expression Browser, you can also create variables. For example, you might click on the Locals listing, right click and select Insert Boolean. Name it and double click on it. It will show up in the Expression window below. You've just assigned a Boolean from your VI to a TestStand Boolean,