Use the Section.Clone method to create a duplicate of a particular section.
Example SectionsCloneSection
Shows how to create a duplicate of a particular section.
[C#]
Document doc = new Document(MyDir + "Document.doc");
Section cloneSection = doc.Sections[0].Clone();
[Visual Basic]
Dim doc As Document = New Document(MyDir & "Document.doc")
Dim cloneSection As Section = doc.Sections(0).Clone()
[Java]
Document doc = new Document(getMyDir() + "Document.doc");
Section cloneSection = doc.getSections().get(0).deepClone();