In WPS Office, the "serial number" is officially referred to as the Product Key Activation Code

If you lost your key, you can contact WPS support with your order ID or the email address used during purchase. 4. Avoiding "Cracked" Serial Numbers

Fill Series Command

: For very large ranges, use the Fill button on the Home tab. Choose "Series," select "Columns," and set your "Stop value" (e.g., 100) to instantly generate numbers from 1 to 100.

serial number

If you meant as in: