Need help to get the sum of the bookings.

I need help with the calculation part. I need to be able to get the sum of the bookings.

Sure. I did check your form and you seems to have already added condition to add the values of all form fields. The only issue I see is that you have not set the "Calculation Values" in any of your dropdown fields. I would suggest you to please add "Calculation Values" in your fields and then only you will be able to add the calculation. You may like to take a look at the following guide which should help you:  https://www.jotform.com/help/301-How-to-Assign-Calculation-Value

Please explain your complete calculation requirement and with the value of each dropdown options, we will try to help you.