Thanks for joining in on the thread, @-clear-.

I’m glad to further assist you with creating a new file from your existing company file. Before you start a new company file, you’ll need to gather these reports to re-create the accounts receivable and accounts payable year-end balances in the new company file. You’ll need to create the opening balances for all the balance sheet accounts and to manually enter inventory value, stock status, and outstand banking transactions.

Customer Balance Detail report

1. Select the Reports menu.
2. Find the Customer & Receivables and then choose Customer Balance Detail.

Vendor Balance Detail report

1. Go to the Reports menu.
2. Click Vendors & Payables and then pick Vendor Balance Detail.

Standard Balance Sheet

1. Locate the Reports menu.
2. Choose Company & Financial and then go to the Balance Sheet Standard.

Once done, you’ll want to start a new company file.

1. Go to the File menu, choose Utilities, then Clean Up Company Data. 
2. Make General Journal Entries from the QuickBooks Company menu.
3. Rebuild the outstanding balances in accounts receivable by either creating balance forward invoices for a lump sum customer balance or re-creating individual invoices.
4. Recreate vendor balances from the Vendors menu with the Enter Bills option, charging these bills directly to the Uncategorized Expense account, as opposed to individual expense accounts.
5. Choose File, then New Company.
6. From the Easy Step Interview window, click Start Interview.
7. Follow the on-screen instructions to enter the information for your new company file.

If your company file is too big, you may also condense the data.

This link has more information about creating new company files:

https://quickbooks.intuit.com/learn-support/en-us/account-management/re-great-to-hear-from-you-lap20...

If you have other questions, let me know.