The web.config for a store can be edited to point to the subscription datastore used by another store (if you do have multiple stores on same Storefront server).
Note, this is not officially supported by Citrix
So how do you do this? Look for the following section in web.config for the store, and change the store name portion (highlighted in bold style):
clientEndpoint uri=”net.pipe://localhost/Citrix/Subscriptions/1__Citrix_Store