Glad to have you here in the Community, aa1745.
I'd be glad to help you reconcile your business transactions with a personal account.
When setting up a bank account, QuickBooks lets you enter the bank's opening balance. If you already set up your bank without an opening balance, below is an article with detailed steps on how to enter an opening balance.
For your second question, reconciliation would not be going to work on this because you use your personal account in some business expenses. Reconciliation will be based on your bank statement. You will not get the right ending balance if you exclude personal transactions and just reconcile the business transactions. And or the previous months that cannot be imported through bank feed, you can manually bring the transaction into QuickBooks using a WebConnect feature.
Here's an article with detailed steps on how to upload a WebConnect file: https://quickbooks.intuit.com/community/Banking-and-bank-feeds/How-to-upload-more-than-90-days-of-ba....
If you'd like to go through this over the phone, you can call our dedicated team who will be happy to assist you. Our contact details can be found here along with our opening hours.
The Community is always here to help you out. You can always leave a reply, I'll help you the best I can. Happy Holidays!
