Here's how you use ReferenceDataManager

gistfile1.cs

ObjectId hierarchyId;
var builder = new ChangeSetBuilder(objectFacade, null);
{
    var hierarchy = builder.CreateHierarchy();
    hierarchyId = hierarchy.Id;
    var parentUnit = builder.CreateUnit("Parent", new Address("Lubicz", "23", "Krakow", "PL"));
    var childUnit = builder.CreateUnit("Child", null);

    builder.SetHierarchyRoot(hierarchy, parentUnit);
    builder.SetParent(hierarchy, childUnit, parentUnit);
} 
var view = objectFacade.GetSnapshot(builder.PendingChanges);
{
    var hierarchy = view.GetById<Hierarchy>(hierarchyId);
    var rootUnit = hierarchy.RootUnit;
    var childUnits = hierarchy.RootUnit.GetChildrenWithin(hierarchy);
    var firstChildUnit = childUnits.First();

    Assert.AreEqual("Parent", rootUnit.Name);
    Assert.AreEqual(new Address("Lubicz", "23", "Krakow", "PL"), rootUnit.Address);
    Assert.AreEqual("Child", firstChildUnit.Name);
}