Well, if you want replace the contents of cell A1 with just the first 6 letters of what is in A1, you have multiple options (not all listed):
1) Use a macro to replace all characters to the right of the letters with ""
or
2) Assuming your data starts in cell A1, use this formula in B1 and fill down: =LEFT(A1,6)
You can then copy B1:Bxxx and using Paste Special: Values over the contents of column A.
Of course, if your data has varying amounts of letters before numbers, then you will have to use a different formula, one that searches for the first number in each cell and only copies the first letters to the new cell. Something like:
- Moo
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