add a column and put this formula in the top cell:
=LEFT(A2,4)&"."&MID(A2,5,4)&"."&RIGHT(A2,4)
This assumes your data is in column A and starts in cell A2. Drag the
formula down. Select the new column of data. Copy it and then Paste
Special | Values back over itself. You can then copy the data over the
original if you wish.
add a column and put this formula in the top cell:
=LEFT(A2,4)&"."&MID(A2,5,4)&"."&RIGHT(A2,4)
This assumes your data is in column A and starts in cell A2. Drag the
formula down. Select the new column of data. Copy it and then Paste
Special | Values back over itself. You can then copy the data over the
original if you wish.
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