Follow the below mentioned steps to block existing domain from placing new order in WHMCS.

Step::1 Login to your WHMCS.

Step::2 Hover over the Setup section and click on general settings.

Step::3 Now jump on to the Ordering tab.

Step::4 Scroll down to bottom of the page and look there for Block Existing domains option & tick on it to enable.

Step::5 Click on Save changes.

That's It !
Check out the video tutorial to get in detailed procedure. You may refer to the blogas well.
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