Reverse engineering

Hi,
Iam suman Raj.
iam doing reverse engineering for a surface model, after completing the part, when using delete useless elements option, the total specifications tree was highleted ..
Please rectify my problem
2 Answer

The Delete Useless Elements command is based on solids - not surfaces. It will delete everything that is not necessary (not a parent) for the solid definition.
I believe you said you have a surface model, so this command will not work in your case, as you have discovered.
If you still want to use the command, make a solid from your surface first.