Tutorial Post 14: Copying.

We can make copies of selected elements. We will make a copy of the two red segments.

The segments already have been selected (with a key sequence: 'QSX').
We invoke Copy submenu on Data Menu (key sequence: 'QDC'):

Note that there are four kinds of copying. The term 'GLUE' denotes connection between the original and its copy. A segment's endpoint can be connected with its copy by a segment. A segment can be connected with its copy by two triangles. There is no   'GLUE'   option defined for a triangle and its copy. (In most cases you do not want glues between triangles and their copies!)

First, lets make the copy without any 'GLUE' ('QDC0').

The endpoints have been copied and placed in a new (unused) set. The old endpoints are un-selected and their copies are now selected. The copies are placed in the positions of the originals. To see that we have really made a copy, select action 'SELECTION MOVE' (key sequence: 'AS') and   move the selected copy with arrow keys.

Now, lets make copy of the first copy with the glues between the endpoints ('QDC1') and move the selected new copy with arrow key to see the results:

And finally, lets make a copy with glues between the segments ('QDC2') and move the copy:

The key sequence: 'QDC3' would make another copy with both kinds of glues.