We are using Azure DevOps Repo as our code repository and there are 3 branches on there. They are Dev, UAT and master. When a developer needs to work on a feature, he/she creates a feature branch from Dev and then work on the feature branch. Once the development is completed, they merge the changes from the feature branch with Dev by creating a Pull Request. When the changes are ready for testing, we will merge Dev branch with UAT branch. At this time, we need to exclude some features, and we don't need to merge those into UAT. So, my question is how to do it on Azure DevOps Repo?