How to draw the plan of glasses with CAD?

Auxiliary lines are some lines used for positioning. In fact, there are no such lines. They just help you locate. Make a dotted line, for example, if you want to draw as many points as a pentagram, you need to draw some lines first, and these lines intersect or generate some points in other ways, and then you can connect these points into a pentagram! (I don't know if you understand this)