To track business income by subcategories (for example, Consulting, Lecturing, Analysis), I create a corresponding Product & Service assigned to each subcategory which I then may invoice as part of a project for a given client.
When issuing an invoice that includes a one-time charge, how can I specify the Business Income subcategory to which I want the charge attributed rather than it being assigned to the parent Business Income category (which then may not be edited later)?
Thanks in advance