How to create an add-in?
•Create a new presentation and add code to its VBA project, and create any custom toolbars or menu bars.
•When you've tested and debugged the code, compile the project by clicking Compile VBA Project on the Debug menu.
•Save the project as a PowerPoint presentation, with the extension .ppt, and then save the project as a PowerPoint add-in, which has the extension .ppa.
•Important Once you save the project as a PowerPoint add-in, you can no longer view the VBA project. Therefore, you should also save your PowerPoint add-in as a standard presentation, in case you need to make changes to it and resave it as an add-in.