What error are you getting when you try to perform the Copy operation?
Is the field disabled?

I just did a test on two calculated fields, one calculated in a query and one calculated on the form. Both worked fine.

I am looking at the Account Balances v1.0 Template that Richard published.

Here is the error

Needed is AmtXfer in the AccountQ

The field is not locked but it can not be edited because it is a calculated field. So it says.

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I was able to modify Richards sub to include the DoCmd.RunCommand acCmdCopy and it works
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Public Function SelectAllCopyText()

    Dim C As Control
    
    Set C = Screen.ActiveControl
    If IsNull(C.Value) Then Exit Function
    C.SelStart = 0
    C.SelLength = Len(C.Text)
    Set C = Nothing
    DoCmd.RunCommand acCmdCopy
    
End Function
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