Hello,
You can establish multisite with WoodMart and all these sub-sites would be independent: one can have a store, another can leave without the store, and emails, prices order would be kept separately.
2 – How do we manage my stores with the same Backoffice? I found this plugin: https://woomultistore.com/ – Yes, you will need a plugin, we have not tested this plugin with our theme, we cannot guarantee 100% compatibility.
If you have any questions please feel free to contact us.
Best Regards