Creating Setbacks

[PetraBuchanan]

I have gone over the perimeter video again and again. I create the terrain perimeter. I make it the shape I want. I click on the perimeter. I click the copy paste icon in the tool bar and move the cursor to the corner of the perimeter; I hold down the c key while moving my mouse. The set back is created. Yay!! and then if I do anything else at all? it goes away. Please. Can someone tell me where I am going awry? Then he also said to click the tab key so a box pops up you can do stuff in, except hitting the tab key is doing anything else. The image disappears. I then found another terrain video hoping it was a different version of chief but no, same instructions/same dude. Thank you in advance. 

[AsPlanned]

Turn on you "CAD, Default" layer and you will see the setback polyline again.

[richoffan]

When you click copy, next click copy in place the icon with the H. You need two lines overlayed so when you move one the other stays