How to change the advance booking days of an individual activity
If you set the advance booking days for a specific activity, this will override the global advance booking days or price band advance booking days which you have set (found in the Bookings sub-section of your Settings).
1. Go to Settings > Activities.
2. Click on an activity to open it up.
3. Scroll down to the Additional booking settings green cross symbol.
4. Set the Use activity advance booking days option to Yes.
5. Alter the Advance booking (days in advance) option from the drop-down box.
6. Click Update activity at the bottom of the page.