Try this:
Sub submit()
Dim wbThis As Workbook
Dim wbDest As Workbook
Dim rng1 As Range
Dim rng2 As Range
Dim rng3 As Range
Dim rng4 As Range
Dim rng5 As Range
Dim rng6 As Range
Set wbThis = Workbooks("C:\Users\Invoice.xlsm")
Set wbDest = Workbooks.Open("C:\Users\Packing Slip.xlsm")
rng1 = wbThis.Sheets("Sheet1").Range("B23:B45")
rng2 = wbThis.Sheets("Sheet1").Range("F23:F45")
rng3 = wbThis.Sheets("Sheet1").Range("GF23:GF45")
rng4 = wbDest.Sheets("Sheet1").Range("B23")
rng5 = wbDest.Sheets("Sheet1").Range("H23")
rng6 = wbDest.Sheets("Sheet1").Range("J23")
rng4.Value = rng1.Value
rng5.Value = rng2.Value
rng6.Value = rng3.Value
wbDest.Close
End Sub
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