You are probably going to need a macro something like the following which
sets the pagesetup for each section so that the FirstPage comes from a
particular tray (I don't know which one it will be in your case) and then
prints out that section:
Dim i As Long
For i = 1 To ActiveDocument.Sections.Count
ActiveDocument.Sections(i).PageSetup.FirstPageTray = wdPrinterLowerBin
'modify as required
ActiveDocument.PrintOut Range:=wdPrintFromTo, From:="s" & i, To:="s" & i
Next

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Hope this helps,
Doug Robbins - Word MVP
>I have a merged document that is a series of 3 page reports combined into
>one
> long document. The first page of every three page report needs to print on
> letterhead paper from tray one on our printer. The other pages need to
> print
> from tray two on our printer. Is this possible to do? How?