Duplicating Entire Hierarchies?

Hey there… I’ve been using blender for a week or two now… and I’m faced with an annoying problem. I have created a 3D model and separated some parts of the model to individual objects in blender. I added an empty object and using the Crtl + P shortcut, made my model’s parts children of the empty object.

My problem is that if I try to duplicate my “empty” object, I only get a copy of that object, and not all other child objects that it has.

Sooo How Can I duplicate the entire hierarchy and not just the parent object?

Thanks in advance for any replies.

Have all the objects selected when you copy. Shift+G will allow you select all the children of an object