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I have a very large list of numbers that range in size from 9-17 characters. I need to add periods to make them compatible with a specific program.

Example: 1000409180201 --> 10004.

Is there a way to do this with custom formatting or VBA?

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up vote 0 down vote accepted

With your data in A1 , in another cell enter:

=LEFT(A1,5) & "." & MID(A1,6,2) & "." & MID(A1,8,2) & "." & MID(A1,10,2) & "." & RIGHT(A1,2)
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You're my hero. Thank you!! – Sarah Mar 29 '14 at 0:45

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