Deleting lines from a drawing

[Totev]

Hello.
I have a problem. Creating a drawing of a 3D model sometimes generates parasite lines (when the model is complicated). I'd like to remove them but don't know how. Even in "expand member view" I cannot delete lines. I hope you can help me.
Currently using NX5 (5.01 I think or 5.001).

 

[ewh]

Try erasing them.

 

[moog2]

view dependant edit , will do this for you, try that...

 

[Totev]

Thank you.