EDITING 3D SOLIDS.

#1
Hi All,

How do I edit the length of a 3D solid, box.
I can slice it to make it the required length, but is there a easier way?
Something on the proceedure of triming a 2D
rectangle?
Dimensions in question....X=5.5 Y=1.5 Z=220
Need to trim 4" off Z Dim.
Thank You,
ERIC.