One way is to browse the vi hierarchy. THis is done by opening your top level vi and selecting the browse toolbar item and selecting browse vi hierarchy. This will show you a hierarchial view of your applications. This will show you all of the linkages to the subvi that you are looking for. The other way is to use the find option. This can be done by selecting Ctrl-F. This will allow you to search for a specific vi or other objects. This will also allow the searching of text. Once you find your subvi you can select ctrl G and skip through all of the instances. Hope this helps.
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor