Macro value "Text" linking to input cell value of another sheet

Hello:help
Based on my previous thread :

http://www.vbaexpress.com/forum/show...ight=hide+rows

Is it possible to link the macro value from a cell from another sheet, so the user can choose his own letter to hide/unhide the rows :

Code:

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Value "O" to sheet 2 range B2:
 If UCase(Target.Value) = "O" Then
    Value "C" to sheet 2 range B3:
ElseIf UCase(Target.Value) = "C" Then
  'As well for the module :
  (UCase(cll.Value) = "O" Or UCase(cll.Value) = "C")

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Thanks very much for your help