Joining lines to create polylines whilst using shared lines

[jon_conwayZX5GU]

Hi All,

I am interested in seeing how I can save myself significant amounts of time by being able to resolve my query.

I have a basic shape, save a cube shape. It is wireframe, 3D view. It is made up of a total of 9 lines. I want to create the 3 sides of the shape by joining them together to create 3 x polylines but I only have one line that is shared and I don't want to have to copy and paste the line and then join.

Is there an easier way to duplicate the lines that 'shared' so I don't need to copy, paste and then join?

[Washingtonn]

You could use a block having vertical, parallel and coincident constraints as shown below instead of using polylines.