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
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.