I do not believe anyone here can help you, that is an exceedingly ambiguous question. Center of pressure is an aerodynamic term, and you'll need to determine airfow, direction, air density, etc. This is NOT what Pro/E (creo) does, and this isn't the forum for that.
Did you perhaps mean center of GRAVITY (CG)? Now THAT, you can get in Pro/E, after assigning model material parameters (needed for MOI info, but not CG info)/