In QuickBooks Online, you can connect as many accounts as you want. Connecting your bank will save much of your time since you won't need to enter those transactions manually. I'll show you how.
Go to the Banking menu or Transactions menu.
Select the Banking tab.
Click Connect Account on the landing page if this is your first time connecting. Or select Add account or Link account if you've already created one.
Search for your bank. You can connect with most banks, even small credit unions.
Hit Continue. Enter the username and password you use for your bank's website in the window.
Follow the onscreen steps to connect. Your bank may require additional security checks. It may take a few minutes to connect.
Choose the bank or credit card accounts you want to connect (savings, checking, or credit card). You should see all of your available accounts at your bank or credit card company.
For each account, you connect, select the matching account type from the dropdowns. These are accounts on your chart of accounts in QuickBooks.
Select how far back you want to download transactions. Some banks let you download the last 90 days of transactions. Others can go back as far as 24 months.