If you have a document object node, which is a paragraph or a direct child of a paragraph, you can point the builder's cursor to this node. Use the DocumentBuilder.MoveTo method to perform this.
Example DocumentBuilderMoveToNode
Shows how to move a cursor position to a specified node.
[C#]
Document doc = new Document(MyDir + "DocumentBuilder.doc");
DocumentBuilder builder = new DocumentBuilder(doc);
builder.MoveTo(doc.FirstSection.Body.LastParagraph);
[Visual Basic]
Dim doc As Document = New Document(MyDir & "DocumentBuilder.doc")
Dim builder As DocumentBuilder = New DocumentBuilder(doc)
builder.MoveTo(doc.FirstSection.Body.LastParagraph)
[Java]
Document doc = new Document(getMyDir() + "DocumentBuilder.doc");
DocumentBuilder builder = new DocumentBuilder(doc);
builder.moveTo(doc.getFirstSection().getBody().getLastParagraph());