Hi! The custom order numbering plugin I have been using is no long officially supported so I want to switch over to use the Booster feature. I want to continue to use a letter prefix, and sequential numbering. Can I switch without changing the numbers of existing orders?
Actually, You can definitely use a booster add-on for sequential order numbering. Once you define the last order ID which is currently there the sequencing process will start from that. Regarding prefix, if you enable any prefix it will also be added to old numbers.