How to get only the boundries using Drawing composition

Dear Bentley Support, 

My sections and elevations views are having more lines along with the element edges while using Drawing Composition Method from AECOsim. 

I've also tried controlling these in Display styles similarly using Drawing Extraction Manager method.

Here is the snap of the elements (Bridge Viaduct).

I need only the edges (Clear cut Outlines). 

Please can you help out on this?

Regards

Balaji G