I assumed you are talking about section 22.214.171.124, restore the Factory_image, application_image_1 and application_image_2, and compile all three designs.
From the reference design given, add the appimage2.bdf in the project, set as top level and compile it.
Then you will get the top.sof file in the output_files. Rename the top.sof file to app_image2.sof or other preferred name.
You can do the same way with the factoryimage.bdf and appimage1.bdf. With that, all the .sof file will be generated.
Hope it helps.