what about to use =substitute(a2,"-","")
hth

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regards from Brazil
Thanks in advance for your feedback.
Marcelo
> I have a long column of NIC's MAC Addresses WITHOUT the dashes between every
> 2 characters. Need to know how to create an excel custom format to make them
> all have the dashes without manually putting in dashes.
You could insert a helper column and make it look like you want:
=if(a1="","",mid(a1,1,2)&"-"&mid(a1,3,2)&"-"&mid(a1,5,2)&"-"&mid(a1,7,2)& ...
(I got tired! Just continue until you're out of numbers! <vbg>.)
> I have a long column of NIC's MAC Addresses WITHOUT the dashes between every
> 2 characters. Need to know how to create an excel custom format to make them
> all have the dashes without manually putting in dashes.

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Dave Peterson