Yes, you can! 

To add another store of the same Sale Channel (for example, another eBay store) it's not necessary to edit the first one. 

You can simply add a new store, clicking again on the relative icon on the left side of the Marketplace page.

You'll then be able to enter a custom label to recognize the same marketplaces connections among all the others:
 

Read this article to find out how to edit your connected Marketplaces:

Done! 🎉

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