...I understand... but it leads me to a different question. For MacCad is it best to set up line weights with color and use the same color for different objects or to use pen styles? One of the reason in classes I used color for objects was because it was easier to transfer it to illustrator to change colors/line weights for illustrations and diagrams. 

What would be best practices for setting up CTB files?

by the way... you're awesome! 

Tricia