Sorry, I had just gotten up, and wasn't thinking straight apparently, so I had to edit this post.
Make a command with your variable in it. Then set it to load when the profile starts.
Edit the profile where your variable command is. At the top you'll see a square with a check in it.
Click on it.
Then down near the middle of the profile options menu you'll see. Execute command each time this profile is loaded.
Use the drop down menu, and select the command with your variable in it.
Now when you start this profile, it will set the variable.
You can also Add the profile to start when VA starts.
On the Right bottom corner of VA click the
Then under General, go down near the middle you'll see, Load Profile on Startup.
Use the drop down menu, and pick the profile you want to be loaded.