I have confusion regarding part default color and feature color.
1. How can I change any feature color to the body default color!!. Sometimes part may have grey color and the edge blends will have yellow color.
2. While editing any feature(For example while extracting faces), how can I change face selection color!!!!!
Take a look at the settings 'Display Properties for New Geomtry' under, Menu > Preferences > Modeling > General.
Also General and Edge display settings under, Menu > Preferences > Visualization > Visual.
For question 1, if a feature has a color assigned, you can right click on the feature, choose "assign feature color", and change the color option to "no color".