How do I copy required records from tables of one entity to another entity in Entity Framework?

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C#

EF5.0

The following is a partial of my DB Schema.

https://drive.google.com/file/d/0Bx3eJEwRdRm5MkNDcjBoSGI1NVE/view?usp=sharing

I have two lists containing parentNames and the leafNames I need. Now, I need to copy the required records from one entity's tables to a newly created entity's tables.

Cloning is really not an option here. How can this be done?

I have tried:

var originalEntity = _entity.ParentTable.Include("ParentToChildTable")
                           .Include("ParentToChildTable.ChildTable")
                           .Include("ParentToChildTable.ChildTable.LeafTable")
                      .AsNoTracking().Where(a => parentNames.Contains(a.Name));

_NewEntity.ParentTable.AddRange(originalEntity);
_NewEntity.SaveChanges();

But this copies all the records associated. And I can't figure out how to go about selecting LeafTable's records.