No. To add different materials to the same body you have to make the single body into different parts.

For your better understanding I have included a file showing a projectile that has steel at the center and copper outer layer. To model this in Ansys 14.5 Workbench, you would have to make to different bodies and then add the material seperately.

Hope, this will help you.

Thanks for your replay, If we model in any design, software it possible to split the model in ansys work bench and re unify it