There's far too little detail on what you're asking for here.
Do you mean you want a flag on issues in a project? If so, look at the "custom fields" in the standard docs.
If you want flags at a project level, then I'm afraid you're stuck - Jira doesn't do it, and although there are plugins that might help, you can't use them in OnDemand.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.