select column based on cell input

Hi, I have a macro that selects an entire column based on an input box.

Macro2 Macro
'
    Dim UserReply1 As String
    
    UserReply1 = InputBox("Enter column letter to hard code")

    Columns(UserReply1 & ":" & UserReply1).Select
    Selection.Copy

I would like to change it so that it selects the entire column based on the value of 1 cell. ie ( Set up tab, cell A1). And then select that column for every worksheet in my workbook ( there's like 20 ). I appreciate any help. thanks.