Sub tocaps()
Dim ws As Worksheet, LR As Long, i As Long
For Each ws In Worksheets(Array("Sheet1", "Sheet2", "Sheet3", "Sheet4"))
With ws
LR = .Range("B" & Rows.Count).End(xlUp).Row
For i = 1 To LR
.Range("B" & i).Value = UCase(.Range("B" & i).Value)
Next i
End With
Next ws
End Sub