Hi @Michael ,
Correct, you have just to enable Upgrades classification under the Software Update point Properties then download the feature update and deploy it to your Windows 10 1803 collection.
They will receive the feature update like any other simple update in the Software Center.
For more details, you can follow this guide:
Regards,
Youssef Saad | New blog: https://youssef-saad.blogspot.com
Please remember to ** “Accept answer” ** for useful answers, thank you!