How to make 2 loops execute simulataneously?

I want LabVIEW to continue to take data so it may be recorded to file. I also want LabVIEW to run a control loop to ensure the conditions of my test remain true. It seems that way I presently have the vi configured this cannot happen.

How to control an Electronic Load to give me a constant power output.

I need to keep a constant power output on my electronic load. The voltage and more so the current will be dynamic in order to keep the power constant. I am new to Labview and am trying to write code to accomplish this task.