Can we allow a customer to reserve the entire resource (all its shares) for special price?

Yes, you can. For example, suppose you already have a resource with a single shared price option—such as a cafe-bar with 10 tables.

1. Create an additional price option.
2. Enter the name and, if needed, a description.
3. Select the type — Whole resource.
4. Set the price.
5. Save.

Now, there are two price options available for booking. The configuration will look like this:

If you want to add a description for the Shared radio button, go to the Localization panel in the widget settings. Then, add a translation with the key RESERVATION__SHARED_DESCRIPTION.

It will appear like this in the widget:

If you book the whole place, the shared price option for individual tables will no longer be available. Conversely, if at least one table is booked, the whole place option will be hidden.

See the result in the widget below: