Please help me MIGRATE a project to an empty project

Thank you for your reply christuusgnosis,

You said, when I build just a single map. Could it be that I am building a whole project?
If so, how to build only an opened, current map?

This is how I do it:

I click on ‘Platforms’ select ‘Windows’, chose ‘Shipping’ and click on ‘Package Project’. Probably the problem is here right? Do you know how to package only the map?

Thanks in advance.
Alex