you can handle tolerances in the 3D environment.
Open a part. just click on a feature in the browser bar and select show dimension.
click on a dimension and select dimension properties. Now you are able to set the tolerance in 3D environment instead of 2D drawing.
Just remember that the link to CAM is able to handle this kind of information.
Good Luck,
Martin
Unigraphics NX4,NX3,NX2,R17
Inventor 10,9,8,7
Solid Edge 10,9,8
Solid Works 2000,98
Mechanical Desktop 4,3
Autocad 2004DX,2000,R14, R12
Teamcenter 9