How to make a Wi-Fi cellular iPad only Wi-Fi iPad
How to make a Wi-Fi + cellular a iPad Wi-Fi only.
iPad Air 2, iPadOS 14
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If you are attempting to inhibit Cellular capabilities of a WiFi+Cellular model iPad, simply remove the SIM card from the SIM slot - if fitted:
Remove or switch the SIM card in your iPad - Apple Support
If instead you are trying to add cellular capability to a WiFi Only iPad, this isn’t possible - as it is not possible to change or modify the internal hardware components of an iPad.
Whilst a WiFi Only iPad cannot be transformed into a WiFi+Cellular model, you can use the hotspot feature of a mobile phone - or a Cellular Broadband Router (often known as a MiFi Router) - to access Cellular networks.
How to set up a Personal Hotspot on your iPhone or iPad – Apple Support