What can I do to make parts appear like this in the drawing?
I need to make some modifications in the drawing, but now sure how. Could someone help?
1 - This part inside the red circle it's appearing on both sides, but I need just one side, like in the second image. Besides that, I need the line to be dashed. How can I do that?

(how it's now)

(how it's supposed to be)
2 - I need to show this part in the red circle, also with dashed line, that it's in the model but doesn't appear in the drawing. How can I do it?


