Is there a way to add glossary/help assistance as field description?

[Eva]

We would like to abbreviate some of the fields (b/c some are quite lengthy) and we would want to abbreviate in a way that wont confused the external clients. Is there a way we can set that up in JIRA?

[Nic Brough -Adaptavist-]

For custom fields, just rename them. It won't damage anything, and you can put the longer text in their descriptions.

If you're talking about the built-in system fields, then I don't think you can realistically shorten them usefully. But if you want o try, have a look at http://confluence.atlassian.com/display/JIRA/Customizing+Text

If neither of those apply, then I'm sorry, I've misunderstood the question and I don't understand what you're trying to do.