Is there anyway of tracking old expenses / costs from connected business account more than 3 months ago before I had Quickbooks?

Getting your old expenses from your connected business account is easy peasy, @usercara-mcewan.

Since QuickBooks only download 90 days of your lastest transactions when connecting bank accounts, you'll want to import your old expenses manually to track them. Let me guide you through the process.

First off, let's download the old expenses from your bank to a CSV file. Here's how:

1. Sign in to your bank's website.
2. Follow your bank's instructions for how to download CSV files of your transactions to your computer. 
3. Check the date range for the download. Make sure not to include the transactions already downloaded in QuickBooks.
4. Download your transactions and save the file you can easily find.
5. Then, review the file format and size (350 KB) before importing it.

Once the file is ready, you can now import it manually in QuickBooks Online (QBO). Please be guided to the steps below:

1. Click Banking from the left menu.
2. Select the connected bank account.
3. From the Link account drop-down, choose Upload from file.
4. Hit Browser, then find and select the saved file.
5. Click Next.
6. Select the bank account from the QuickBooks Account drop-down. Then, hit Next.
7. Follow the onscreen steps to match the columns on the file with the correct fields in QuickBooks. And, select Next.
8. Click Let's go once you're ready.

After following the steps above, you'll be able to see your old expenses from your connected bank account in QuickBooks. Here's an article you can read for more guidance: Manually upload transactions into QuickBooks Online.

Just in case you want to learn how to categorise and match your bank transactions properly, feel free to check out this article for the detailed steps and information: Categorise and match online bank transactions in QuickBooks Online.

Should you need any additional assistance while managing your bank transactions, you can leave a comment below. I'll be sure to get back to you.