Add new attachments category on discrete job header

We use WIP and are on 12.2.3 .

We want to add new categories of attachments for use on the discrete job header in the discrete jobs screen.Currently we can only see certain category of attachments like WIP Job/Schedule Attachments and can add new templates under this category by doing the setups in the job/schedule documents screen but cannot add new category of atachments say Variance for instance which will be visible under attachments on the discrete job header.Has anyone tried this?

thanks

rahul