Hi there camrosebooks-gma,
It's vital that all your information be entered correctly for your books to balance. QuickBooks Online Accountant is a great tool able to help you see all your clients' books in one software. I can provide some information about moving data.
In QuickBooks Online, there isn't a way to move all data over from one company to another all at once. The information that can be imported from files can be seen in the Gear icon, then Import data. You can also see more information about what can be imported in this article.
If you have any other questions, feel free to reach out here.
