I am migrating J3 to J4 locally, but meanwhile, I am getting orders on my J3 live website.
How do I add/import these into the migrated/upgraded J4 site?
JMigrator. https://www.daycounts.com/migrator
Works like a charm.. and you can keep over-writing. products and orders.. yes works great for J4. The base version is just for Joomla. there is an addon for VM
Ive' used this to move over many sites to J4 where I had to start from scratch.