For all projects, right-click to use the context menu to add files to a project. Using this method places files in the proper location in project source or resources.
To add a MIDlet, Java class, Java package, Java interface or Other files, right-click the project name or the Source Packages node, choose New, and select the file type.
To add files by format (Project, JAR, Folder, Library) right-click the Resources node and select a format. See Adding Libraries and Resources.