For creating dittos mmm think it's called detailed views now.. used old naming from V4, it's like a autocad block. Haven't had a chance to check if the dittos are scalable, think they need to be that to suite your purpose, anyway maybe you can try and come back to us how it works? For dittos or detailed views.
1-Create new drawing
2-Add detail view (not standard view)
3-Create the shape you desire with wireframe tools, note that the axis will be used as placement reference later
4-Save as .catalog
If you need more shapes then repeat steps 2 through 4
To use it use the from catalog (think it's called like that) and choose your catalog and finally the ditto and place it on the drawing.