Hi,

First of all this is not recommended way. Instead of creating the app using the studio and exporting it to community, you can directly create your own custom module for the same. Now coming to the question, once you export the studio customization, you will get the studio customization as a module. In the exported module you have to remove the dependency of the studio first from the manifest file. 

Then if there is any customization done over the models and views which is only in enterprise edition. You have to remove those codes from this exported module or make necessary changes in it by adding such views or model in the community edition.

For Exporting Studio Customization:  https://www.youtube.com/watch?v=hzRk8UzJ_rs

Thanks