Look at this post, maybe can help you
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absolutely. that is in fact often used. Semantically, you associate issuetypes to a single workflow. the relationship of WF:Issuetype is 1:N.
now i would caution you not to go to crazy with this. keep your WFs as simple as possible especially at first and then carve off an issuetype when you really need to do something different. Just MO.
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