If I have a list of numbers, how do I insert a dash in each one?

[rayofsunshine969]

If I have a list of numbers, 11 characters long, example: 00229603210, and
for each number I want a dash behind every 2nd, 6th and 9th number,
00-2296-032-10. Is there an easy way to do this?

 

[Gary''s Student]

Format > Cells... > Number > Custom > 00-0000-000-00

 

[Mike H]

Hi,

Try this custom format

00-0000-000-00

Mike