I need to remove all the current clients from my client list, how can I accomplish that?

Why do you need to do that?

Because I added fictitious clients for the purpose of testing and knowing my way around quickbooks but now that I am starting my business I need to remove the ones I did just to make it Clean 

I'm here to help you clean up your customer list, ebramgishak.

You can use the batch action feature in QuickBooks Online to deactivate multiple customers at once. Here's how:

1. Go to Sales and select Customers.
2. Check the box of your clients name.
3. Click the Batch action dropdown and select Make inactive.
4. Confirm by clicking Yes, make inactive.

Please take note that if you make a parent customer inactive, you'll have to deactivate their sub-customers or delete the associated project first.

For more information about managing customers, take a look at this article: Add and manage customers in QuickBooks Online.

In addition, visit this article in case you want to personalize and add specific info to your invoice and other form styles in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let us know if you have further questions about deleting a customer in QBO. We'll be right here to help you at any time.