https://help.tallysolutions.com/docs/td9rel54/td9/working_with_projects/creating_projects/adding_program_files_to_the_project.htm

Adding and Removing Program Files in the Project

In Tally.Developer 9, you can add and remove program files in the project.

To add program files to project

1. Go to File > Active Project Properties .

2. Click Add New Files to add new files to the project in the Project Properties screen. Alternatively, click Add Existing Files to add existing files to the project.

3. Click Save to save the file with the specified settings. Alternatively, click Save and Build to save and build the file simultaneously.

To remove program files from the project

1. Go to File > Active Project Properties .

2. Select the file(s) to be removed.

3. Click Remove Selected to remove the selected files.