Use a macro containing the following code on the 4600 page document:
Dim i As Long
With ActiveDocument
For i = 1 To .Sections.Count
.PrintOut Range:=wdPrintFromTo, From:="s" & i, To:="s" & i
Next i
End With
It will send each 16 page letter to the printer as a separate print job

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Hope this helps.
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Doug Robbins - Word MVP
>I have a document that is 16 pages that I am using mail merge to import
> various information from a database. When I do a mail merge my document is
[quoted text clipped - 3 lines]
> know
> how to do this?