How to create per subsite template file with custom press

Hello,

I've installed Custom Press and I'd like to create template files for custom posts, for specific subsites. As described here https://premium.wpmudev.org/project/custompress/#usage I should be able to create template files but it seems it only works at network-level.
How can I create template files at site-level? How does it work precisely? Should I delete the loader.php line 13 and then I'll be able to create templates..? Where will these templates be saved in my files (FTP)?
See I don't want to share specific custom posts and templates within my whole network multisite.
Thank you very much for your help