You can use source control to share software projects between multiple developers. If you check out a file, make changes, and check in the updated file, the updated file replaces the master copy and becomes available to the other developers. However, if you check out a file that is currently checked out by another developer, any change you make to the file will have to be merged with the changes the other developer makes before an updated master copy is saved.
Use the Select LLBs to Merge dialog box, available in the LabVIEW Professional Development System, to automatically or interactively resolve differences between an LLB and two revisions of that original LLB.
You also can merge individual VIs using the Select VIs to Merge dialog box, also available in the LabVIEW Professional Development System.