NHibernate Projections

Question

  _iCriteria = _session.CreateCriteria(typeof(Service));

 _iCriteria.SetProjection(Projections.ProjectionList()

                               .Add(Projections.Property("ServiceMasterId"), "ServiceMasterId")

                               .Add(Projections.Property("ServiceName"), "ServiceName")

                                .Add(Projections.Property("ServiceCode"), "ServiceCode")

                               .Add(Projections.Property("IsService"), "IsService")

                               .Add(Projections.Property("IsRenderable"), "IsRenderable")

                               .Add(Projections.Property("IsProfile"), "IsProfile")

                               .Add(Projections.Property("IsDefaultRenderOnRequest"), "IsDefaultRenderOnRequest")

                               .Add(Projections.Property("DepartmentDetails"), "DepartmentDetails")

                               .Add(Projections.Property("SectionDetails"), "SectionDetails"));

                        _iCriteria.SetResultTransformer(Transformers.AliasToBean(typeof(Service)));

Here I am writing projections on Service object. But Here "DepartmentDetails" and "SectionDetails" are  "many-to- one" to Service object.

how to write projection on Child collections means projections on many-to-one and bags?

Here ServiceMaster, DepartmentMaster and SectionMaster are Three tables. Below is the my oracle query.

SELECT SM.MASTER_ID AS SERVICEID,SM.NAME AS SERVICENAME ,

DM.MASTER_ID DEPTID,DM.NAME AS DEPTNAME,

SECM.MASTER_ID AS SECTIONID,SECM.NAME AS SECTIONNAME FROM SERVICEMASTER SM

INNER JOIN DEPARTMENTMASTER DM ON SM.DEPARTMENTID=DM.MASTER_ID

INNER JOIN SECTIONMASTER SECM ON SM.SECTIONID=SECM.MASTER_ID;

I need same result using NHibernate using projections

Can any one give me reply on This query?