I have Google Analytics for one of my sites, can I use the same code for my three sub-domains as well or do I need different codes for all 3 sub-domains.

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Genn Search

well its up to.. but yes you can use it but all the results are going appear in GA account... but if you want to monitor every subdomain you can add new profile/code

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Cat Door | Barking Dogs

yes u can use the same code anywhere.... even on entirely different sites and they will be counted as one site by the analytics tool...

but i recommend statcounter - i think it's better than the anal' G

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Birmingham Web Development Partnership

as all have outlined you can tag them with the same code but all 3 will show up as 1. I would just setup 2 new sites within Google Analytics.

if you have budget to spend, with SiteCatalyst you would be able to tag a site with the same code and use 'site sections' and/or 's.props'. to break up various sites within the same reporting bucket.

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Internet Marketing Consultant and Pay Per Click Firm