Hi there bigt1919,
Thanks for reaching out about your bank transactions. QuickBooks Online is a great tool able to help you keep track of sales and expenses so you know the profitability of your business. I can point you in the right direction to enter this.
if this is a transfer between two company bank accounts, you can enter it as a transfer. If doing so from the banking tab, click on the transaction in question, then select the transaction type Transfer. Select the other account to affect, and save. if you're wanting to enter one manually, go to the +New button, then Transfer. select the account the money is coming from as well as the one receiving the money, and the date before saving.
If you have any other questions, feel free to reach out here.