Dividing one Company file into two?

It's nice to see you again here in the Community, Holy Lady of Kazan.

To divide the company file into two, you can create a new company file by copying the existing file with the same vendors, customer contact information, chart of accounts and lists.

As for your other concern, to correct amounts of the original company file, you can create a journal entry. However, before we proceed with the steps, I highly suggest consulting your accountant or accounting professional for guidance on which account is for the debit and credit side of the transaction.

To create a Journal entry, here's what you'll need to do:

1. Go to the Company menu at the top. 
2. Select Make General Journal Entries. 
3. Fill out the fields to create your journal entry. Make sure your debits equal your credits when you're done. 
4. Click Save & Close. 

Additionally, I want you to get the most out of QuickBooks for your business. You can check some articles that are designed to help you get acclimated with the software. They can be accessed at the following link: QuickBooks Tutorials.

If you require any further information, let me know by commenting below. I'm here for you. Have a great day!

@Holy Lady of Kazan 

If both companies have the same COA, you may migrate the transaction data to a new company file with the migration tool and delete them in bulk with the deleter tool. Otherwise, it would be easier to create a new company file for each one and separate the beginning balances.

Thank you for your answer. We are trying to do it, but it is still not clear. In our original Company File, there is still an account A, which became a separate company and there is, let's say $2,000.00, which we have to get rid of because they were entered at the time of creating a new Company File "A". Eventually, we will need to make this account A inactive in the original Company File. Now we can not do it, because it has those $2,000.00 and it is showing them in the reports anyway. So, our goal right now is to get rid of those $2,000.00. Are we on the right way at all? Or we are missing something?

Trying to create a Journal Entry in the original Company File, we say:

Account - A; Debit - $2,000.00

But then, what account we put for Credit?