I think to effectively help you we would need more information like hardware constraints. Can your hardware run asynchronously on the same machine?
If you are calling the steps from TestStand then check out the Run VI Asynchronously step. This is located in Insert Step>> LabVIEW Utililty >> Run VI Asynchronously. You can read the TestStand help for information about this step.
Let me know if this helps or what I can do to help you better.
Regards,