It depends on the complexity of the custom field. Some are builtin.
https://confluence.atlassian.com/display/JIRA/Adding+a+Custom+Field
Technically, all the custom fields are handled by plugins, even though the off-the-shelf ones are bundled in all distributions. It's quite important to understand that the plugins don't provide the fields, they provide "custom field *types*". You then add "custom fields" of that type to Jira.
My question here is are you trying to add a "custom field", or a "custom field type"?
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.