Imported all invoices

Imported all payments

Impoted my last Bank Account statement (July)

I was able to match all bank account transactions for July. However since I migrated transactions from Zoho Invoice earlier dates, I have now a missmatch in balances and various accounts.  To keep things simple, I would prefer to "start form scratch" and make July 01 my opening balance date.

How can i effectively deal with previous transcion to July01 in Books, and just adjust the opening balances?  I would need to do some kind of report to see the balances on those accounts, and then adjust the opening balances, and then delete the prior transactions in Books?

I am not an accountant,  and I am looking for a simple way to do this without having to do extensive credits/debits in the various accounts in books.

Thank you,