Can I connect a personal saving account to my QB checking account so I can use it as a funding source and to move money back & forth from one to another?

Thank you for posting here in the Community, @esqangel-gmail-c.

Yes, you're right. To transfer money to and from your QuickBooks Checking account, you'll need to connect your personal savings or en external bank account.

1. Go to the Cashflow tab, then select QuickBooks Checking.
2. Click "Transfer," then select to transfer money between accounts. You're not going to transfer money yet. You'll just need to start the connection.
3. Select the "Add a bank" option.
4. Type in your bank's name, then select your Account type.
5. Type in your account and routing number.
6. When it's ready to connect, click Next.

Once connected, you can now transfer money in and out of your checking account.

Here's how to transfer money out:
 

1. Select Transfer money and then Move money between your account.
2. Type in the amount to move from your QuickBooks Checking account.
3. Select your QuickBooks Checking account in the From field.
4. Select the (+) in the To field. Then select your bank account.
5. Once done, review it. When you're ready, click Finalize transfer.

For further steps about transferring money in and managing your QuickBooks Checking account, you can read through this article: Use your QuickBooks Checking account.
 

You may want to learn how to review downloaded bank transactions and put them in the correct account, you can check this link: Categorize and match online bank transactions in QuickBooks Online.

If you have additional questions about the QuickBooks Checking account, don't hesitate to reply to this post. Have a good one!