Thanks, Kbird1. I'm sorry but it appears I forgot to actually post my response so I will again here. Construction lines are drawing aids, light lines drawn to align two or several objects. Essentially, they are vector lines often drawn vertical or horizontal, but can be at any angle and which are commonly removed before the final drawing is completed. In the HD video she got around using them by drawing a wall the length of the building and then erasing sections she didn't want.
You end with "Please add your Version no# and title to your Signature". By version I assume you mean "HD Pro 2015" although I have no knowledge of previous versions and am assuming the year 2015 denotes a version. I'm not sure what a title is on this forum.