This demo assumes you've already logged in to cPanel
Now let's learn how to create a subdomain
1) Click the Subdomains icon

2) Enter the prefix of your new subdomain here...

3) Make sure the domain name your subdomain will be associated with is selected
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4) A directory name the same as your subdomain prefix will automatically appear... although you can change this if you want. When ready, click Create
 
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Success! A new subdomain has been created.

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A folder called "clients" has also been created, which is where you would upload files for this subdomain. It's located in the public_html directory, and can also be accessed like this:www.mybiz123.net/clients
 
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This is the end of the tutorial. You now know how to create a subdomain in cPanel
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