Tommy
Help says to enter a formula in a cell referring to another cell.
i.e. A1 contain tommy
In B1 enter =UPPER(A1)
If you more than A1 with lower case, you can drag/copy the formula from B1
down column A.
To drag/copy, hover the mouse pointer over the bottom right corner of B1 until
you see a black cross. Click on that and drag down the column.
=UPPER(A1) will change to =UPPER(A2) then =UPPER(A3) etc.
When happy with the results, copy the cells with the formula then Edit>Paste
Special(in place)>Values>OK>Esc.
Gord Dibben Excel MVP