Need to save only a current level and associated assets

I’m working through several iterations of a structure and need to be able to submit for review just one on a given level and package it with just the assets used on that level. That should be something that would occur often enough for the functionality to be there, but in my searches online I’ve found nothing like that and those I’ve asked did not know, either.

Make a copy of your project in windows explorer.

Open the editor and then that project.

Remove the unwanted sub-levels. Save the persistent level,

Package the project.

Only the assets used will be in the packaged version - unused assets in the content browser won’t.

Thank you for your prompt response!