You can setup each report once and for all and save this setup, but somehow I do not think thats what you are looking for so try this:
VM=Left margen
HM=Right -
TM=Top -
BM=Bottom -
Public Sub ChPrtLayout(RapName As String)
Dim PrtMipString As str_PRTMIP
Dim PM As type_PRTMIP
Dim rpt As Report
Dim Marg, VM, HM, TM, BM
DoCmd.Echo False
Marg = 1440 / 25 '1 mm
VM = DLookup("VM", "WF_RapSize", "ReportName='" & RapName & "'"

HM = DLookup("HM", "WF_RapSize", "ReportName='" & RapName & "'"

TM = DLookup("TM", "WF_RapSize", "ReportName='" & RapName & "'"

BM = DLookup("BM", "WF_RapSize", "ReportName='" & RapName & "'"

DoCmd.OpenReport RapName, acDesign
Set rpt = Reports(RapName)
PrtMipString.strRGB = rpt.PrtMip
LSet PM = PrtMipString
PM.xLeftMargin = VM * Marg ' Set margins.
PM.yTopMargin = TM * Marg
PM.xRightMargin = HM * Marg
PM.yBotMargin = BM * Marg
LSet PrtMipString = PM ' Update property.
rpt.PrtMip = PrtMipString.strRGB
ExitHere:
On Error Resume Next
'Set pl = Nothing
Set rpt = Nothing
DoCmd.Close acReport, RapName, acSaveYes
DoCmd.Echo True
Exit Sub
HandleErrors:
' Rudimentary error handling...
MsgBox "Error: " & Err.Description & _
" (" & Err.Number & "

"
Resume ExitHere
End Sub
I have a table where I have the name for the user, the actual name of the report the 4 margens AND the 4 org margins if the user fumbles the setup he/she can get back to normal and the orientation land/port. (true/false)
Function SwitchOrient(RapName As String, Orint As Boolean)
On Error GoTo HandleErrors
Const DM_PORTRAIT = 1
Const DM_LANDSCAPE = 2
Dim DevString As str_DEVMODE
Dim DM As type_DEVMODE
Dim strDevModeExtra As String
Dim rpt As Report
DoCmd.Echo False
DoCmd.OpenReport RapName, acDesign
Set rpt = Reports(RapName)
If Not IsNull(rpt.PrtDevMode) Then
strDevModeExtra = rpt.PrtDevMode
DevString.RGB = strDevModeExtra
LSet DM = DevString
DM.lngFields = DM.lngFields Or _
DM.intOrientation ' Initialize fields.
'If DM.intOrientation = DM_PORTRAIT Then
If Orint Then
DM.intOrientation = DM_LANDSCAPE
Else
DM.intOrientation = DM_PORTRAIT
End If
LSet DevString = DM ' Update property.
Mid(strDevModeExtra, 1, 94) = DevString.RGB
rpt.PrtDevMode = strDevModeExtra
End If
ExitHere:
On Error Resume Next
Set rpt = Nothing
DoCmd.Close acReport, RapName, acSaveYes
DoCmd.Echo True
Exit Function
HandleErrors:
' Rudimentary error handling...
MsgBox "Error: " & Err.Description & _
" (" & Err.Number & "

"
Resume ExitHere
End Function
And to make the whole thing work on the top of your module:
Option Compare Database
Option Explicit
Type str_PRTMIP
strRGB As String * 28
End Type
Type type_PRTMIP
xLeftMargin As Long
yTopMargin As Long
xRightMargin As Long
yBotMargin As Long
fDataOnly As Long
xWidth As Long
yHeight As Long
fDefaultSize As Long
cxColumns As Long
yColumnSpacing As Long
xRowSpacing As Long
rItemLayout As Long
fFastPrint As Long
fDatasheet As Long
End Type
Type str_DEVMODE
RGB As String * 94
End Type
Type type_DEVMODE
strDeviceName As String * 16
intSpecVersion As Integer
intDriverVersion As Integer
intSize As Integer
intDriverExtra As Integer
lngFields As Long
intOrientation As Integer
intPaperSize As Integer
intPaperLength As Integer
intPaperWidth As Integer
intScale As Integer
intCopies As Integer
intDefaultSource As Integer
intPrintQuality As Integer
intColor As Integer
intDuplex As Integer
intResolution As Integer
intTTOption As Integer
intCollate As Integer
strFormName As String * 16
lngPad As Long
lngBits As Long
lngPW As Long
lngPH As Long
lngDFI As Long
lngDFr As Long
End Type
Hope this does the trick for you - works here ;-)