The only way around this is to have the subvi in memory. If you have the subvi in memory you can just pass a string with the name of the vi. For example: name.vi. This will allow labview to search for the vi. You don't need to use the full path but the vi must be in memory. Hope this helps.
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor