How to create multiple app with one ionic project

I have a production ionic app project and try to export another UAT app with
same ionic project.

I try to change appId in capacitor.config.json by append my appId with “.UAT”
and change name. but this doesn’t work. When i did it export over same app,
it’s not export to different app.

What should i change ?

Need HELP, Thanks a lot.