Follow the instructions in this Guide: https://www.manager.io/guides/9572. Especially note the advice to create one transaction and examine it for understanding via Batch Update. The difficulty you will have is the need to decipher and apply all the hexadecimal keys for customers, inventory items, etc.
Batch operations are not trivial. They require a fairly high degree of sophistication. I mean no disrespect whatsoever. But the fact that you were not able to figure this out suggests you may not have the necessary background to understand the process. A search of the forum will reveal many topics where other users express how difficult this is.