consider a hollow cylinder for reference and i want to make a section of the cylinder in keyshot and also render it in keyshot, can it be possible
I don't think so. You'll need to section the cylinder in another program, then import it into Keyshot.
Yes. What I do is split the model in SolidWorks. Then I apply different colors to various features and model faces. When keyshot opens the model, it will treat each color as a unique material, so you can easily apply different materials or colors to your rendering.
can i apply a different color for section for example red only for the section
Here is an example of colors in SOlidWorks converting to different colors and materials in Keyshot.