Sources
(Project Properties window)
*.prj\COMPILE\Sources
The Sources group contains a list of the source files to be compiled for this COMPILE group. To add source files to your project, do one of the following:
Right-click on the Files entry and select Edit Value, or Edit as Filename from the context menu
Right-click on the Files entry and select Manage List… from the context menu to display the Settings:List Manager dialog
Select Add Files to Project... from the Project menu in the Code window.