Hi xela,
Just to make sure, you’re talking about the reservations plugin, and not this menu plugin, right?
If so, then, unfortunately, there’s currently no way to set exceptions that are specific to a restaurant. If you don’t mind, could you please let me know how you have it set up in combination with Business Profile to make multiple reservations modules? Do you just mean that you’ve enabled multiple locations in the Business Profile plugin and then added in multiple locations using the Locations area, so that your reservation form has the new “Locations” drop down in it? If so, that just allows the different locations that you create using the Business Profile plugin to appear as options for locations in the booking form. It uses the schedule you set in the Business Profile plugin, and there is currently no option to create exceptions in that plugin. Perhaps it’s something we can look into adding in a future update.
Duplicate thread/Wrong plugin. User later re-posted the question in the correct plugin support forum: https://wordpress.org/support/topic/per-restaurant-exceptions-2/