I need to stop the use of a particular ticket type but have the old tickets remain viewable for referance.
Is it possible to block creation for one type of ticket in a project?
Yes & you don't need any additional plugin to do it, just an edit to your workflow.
Go to the workflow for the issue type that you want to block creation. Go to the first state (open), then select the "Create" transition. This is the transition that is executed when the issue is created.
To stop an issue of this type being created, add a validator to the transition. I tend to use a Permission Validator. I then use a permission from the Permission Scheme that isn't being used by the project or the Project Admin project (you can generally trust your project admins...)
Add a validator that says the user must have this permission.
When they try & create an issue, the action will fail & they will get a permission error. Not the prettiest, but it works and it's simple.
Some similar questions here:
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