Importing your customers is a great way to increase the efficiency of setting up a new company. QuickBooks Online makes it easy to export your lists, which can then be imported into a different account. This can really save time, and ensures you'll have all the information you need to run your business. I'll be happy to guide you through this.
The easiest information to transfer is the following fours lists:
Customer List
Supplier List
Chart of Accounts
Products and Services List
Transferring these between QuickBooks Online accounts consists of exporting them to Excel, so you can import the file into a second account. It's just a few simple steps:
Sign in to the account that has your list then select Reports.
Depending on what list you need to export, search for and run Customer Contact List report.
You can migrate the lists data between QBO accounts as mentioned by AndréB. Once you need to migrate transactions data (e.g Sales Receipt, Receipt-Payment), you have to use a 3rd party tool.