By default the system will price up your reservation based on two things:
- the dates of your reservation
- the respective Price Group of each Item within your reservation
As shown here, this bike's Price Group has a price of £30 for 3 days so that is what is applied:
And because there is only one bike in the reservation, the total price is £30.
However, if you want more granular control you can make adjustments to each and every row within your Reservation.
Here I changed the price of the bike to £25 and then will press the save button: