Hi Aniket,

sorry for my late replying

I was busy with the critical situation due to the Corona virus in my city , However I divided the solid body in Design modeler causeI could not catch the points located on the body center line  ,So I divided the solid body into two parts as shown in the pic


how can I choose the surface resulting from the division in order to apply the force on it (The surface shown in the image above) ..... selecting by suface did not recognize it ... can u help me to solve this problem?