i too know that by deleting edges faces will be removed. but by doing your above step it will increase the model size when working on big models so my questions is "IS THERE ANY OTHER WAY, OTHER THAN HIDING OR SMOTHERING THE EDGES" I hope you are clear now.

@massimo said:

Double click on the component in order to "open" it-->switch to "wireframe" mode-->select the edges (left click and drag mouse from left to right: you have to select the edges only)-->right click, entity info-->check "hidden"-->switch back to "shaded with textures" mode.

is there any other way to delete [not hiding or smothering]the edges in a single component/group.