I imported a jpg image of a section view of a large radial engine (attached). The sectioning is such that I can measure the true diameter of two different cylinders. Using the dimension tool gives a length of 0.95" for each cylinder. I know that this dimension is actually 6.125".

Is it possible to specify to ViaCad v6 that length thereby setting the unit length for the entire drawing? BTW, that's something I was able to do easily in DesignCad several years ago.

Your tip led me to the correct conclusion. I don't know whether the scale function has changed between V6 and V7, but, eventually, I was able to decipher what the various points that the command requires actually mean. Getting the scale factor in was easy, but I don't understand why I need to specify the final point. Telling the program what to scale and the scale factor should be sufficient. In V6, one can specify uniform scaling and scale factor. As I said, that should be sufficient.

Also, it would be very nice if one were able to go from the tool box function directly to the documentation to get the terms defined.

Of course, this isn't rocket science - rocket science is a lot easier!