Hello qbdt_finance@aut, thanks for reaching out to the Community
It's not possible to migrate data directly between two QuickBooks Online companies.
If you are not intending to purchase a payroll subscription for each company file in QuickBooks, you can export and import the payroll journal that is produced after finalising the payroll.
To export, open the Journal entry and select More > Transaction journal. On the report that opens, select Export/Print > Export to Excel. Once saved to your device, import by signing into the relevant QuickBooks company and click the Gear icon > Import data > Journal entries.
If you have any further queries, drop us a message down below!