One thing to note is that you have a veaiety of things that you can use to create coordinate systems... If you have an existing model, you can use edges, and vertices, to define location and direction of 0,0,0,, and x,y,z... you can also use sketch geometry too either a 2d or 3d sketch line or point can be used to define the axes and origin.... food for thought
Regards,
Jon
jgbena@yahoo.com