Chris, thanx, but I m not talking about hatching lines. I m talking about the lines which are produced when solid surfaces are cut by cross section plane. My actual part is a bit complicated. So, Just for an example, i have attached a pic. In the pic, in left view, i want to erase the red hilighted lines (i.e lines of holes). I will erase hatching too. Now, how can I erase red lines? I hope u can understand my question now.