If the existing project is not the Gradle project then the process of adding a module is the same as Creating a new Gradle project. If the existing project is a Gradle project, then the process of adding a new module is shorter. You need to specify the name of your module in the ArtifactId field. The rest of the information is added automatically, and you can use either the default settings or change them according to your preferences. Also, note that Add as module to field, by default, displays the name of your project to which you are trying to add a module. You can click to select a different name if you have other linked Gradle projects.