Select Add existing clients.

Welcome to QuickBooks Community, gerdacg-gmail-co.

To clarify, what actions are you performing in QuickBooks where you get the option to select Add existing clients? Any additional details you can provide me will help to ensure a timely solution.

Here are articles related to managing your clients for additional reference:

• Client list syncing FAQs.
• Add clients to QuickBooks Online Accountant.

You can get back to me if you have additional questions. I'll be glad to answer them.