Not totally sure of what your asking for but I worked up this approach,
which Summaries to the First Position Worksheet named "Master" in
Cells A2:B4 (say)
all the worksheet names and the Usedrange address of each.
Post this code into a satndatd module:
Sub Foo()
Dim Cwsused As String
Dim i As Integer
For i = 2 To ThisWorkbook.Worksheets.Count
WsName = Worksheets(i).Name
Cwsused = Worksheets(i).UsedRange.Address(0, 0)
With Sheets("Master")
Cells(i, 1).Value = WsName
Cells(i, 2).Value = Cwsused
End With
Next i
End Sub
Post back to further define what you really want.
Jim May