Go to Settings and Configurations at the top right of your screen. This will take you to this page:
Within the horizontal navigation bar, select Accounting. Then, select Invoice Types from the drop down. This will take you here:
To make an invoice type active/inactive, select/deselect the check mark to the right of the name.
When done, click the Update button in the bottom right-hand corner to save changes.
Additional Invoice Types may be personalized to individual organizational requirements and reporting.