Try this:
Sub LockCells()
Dim sh As Worksheet
Dim UsdRngAddrss As String
Dim sLocked As Variant
Dim sHidden As Variant
UsdRngAddrss = Workbooks("Master Workbook.xlsx").Sheets("Master Sheet").UsedRange.Address
sLocked = Workbooks("Master Workbook.xlsx").Sheets("Master Sheet").UsedRange.Cells.Locked
sHidden = Workbooks("Master Workbook.xlsx").Sheets("Master Sheet").UsedRange.Cells.FormulaHidden
For Each sh In ActiveWorkbook.Sheets
sh.Range(UsdRngAddrss).Locked = sLocked
sh.Range(UsdRngAddrss).FormulaHidden = sHidden
Next sh
End Sub
From your active workbook, hit the keys ALT+F11. Insert a module by Right-clicking on the workbook name in the navigation pane on the left. Select "Insert" -> "Module". Paste the above code into this module. Then put your cursor in the pasted code and go to "Run" -> "Run Sub/Userform"
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