Hi Stefano,

re:
> Hi Michael, is it possible to "select all" where it only picks the edges that span a z axis.
> E.g. are vertical edges not horizontal ones.Might be 16 of them on a frame solid as shown...
> 2x4 inside edges, and 2x4 outside edges.

You can do a crossing window selection to do that, select one edge then drag the window from right towards the left through the middle of the object:



- Michael