You can do this using the Windows Update service. Via Control Panel > Administrative Tools, you can access Services. In the Services window, scroll down to Windows Update and turn off the process. To turn it off, right-click on the process, click on Properties and select Disabled. That will take care of Windows Updates not being installed on your machine.
But since Windows is a Service now onwards, you have to keep your computer updated. To be able to install the next set of features or a newer build, you will require the earlier updates to be installed. That’s why if you use the above workaround, you will have to go to the Services and turn it on once in a while to download and update your copy of Windows.
After you turn on the Windows Update service, when you open Windows Update in PC Settings, you will see a message that updates were not installed because computer was stopped. You will have to click on Retry so that all the available updates are downloaded and installed. This may take two or three “Check for Updates”. You will have to keep on clicking “Check for updates” until it says your computer is up to date. Then you can go back and turn off the Windows Update service until next time you feel you are free enough to spend time updating your copy of Windows 10.