WooCommerce Bookings

I’m making a site for a camping and they offer, during summer, the possibility of booking 3 days but pay for only 2.

It would be great if Bookings could be set up so that if you set a number of consecutive blocks (in this case 1 block would be 1 day) you could also set the number of blocks to charge.

When booking X (consecutive) blocks –> charge for X blocks.

I apologise if these is already doable, but I can’t for the life of me find the way to do it.

Thanks!