If you can run the following example and see two plots on the XY graph, you have the multiplot XY graph.
If you cannot, you probably need to invest in the Full Development System or the Professional Development system.
There are three "Levels" of LabVIEW (Base, Full and Professional) and all use the same version number, so knowing you have version 6.0.2 isn't enough information for us to tell you if you have it already.
I do not know how you can check to see what "Level" of LabVIEW you have.