//prepare transformation of mate
                Matrix3D oTransformation = new Matrix3D();
                oTransformation.OffsetX = 20.0;
                oTransformation.OffsetY = 20.0;
                oTransformation.OffsetZ = 0.0;

                //prepare description of mate
                Eplan.EplApi.Base.MultiLangString oDescription = new Eplan.EplApi.Base.MultiLangString();
                oDescription.AddString(ISOCode.Language.L_en_US, "User defined mounting point number 001.");


                //create new point mate object
                PointMate oPointMate = new PointMate();

#pragma warning disable 0618
                oPointMate.Create("UserMate001", "*", oDescription, oTransformation);
#pragma warning restore 0618

                //assign mate to 3D placement
                oMP.AddMatePersistent(oPointMate);

                //find the new mate
                var oUserMate001 = oMP.FindTargetMate("UserMate001", false);

                //remove the mate
                oUserMate001.Remove();

                //oPlane.FindTargetMate("UserMate001", false) == null