Please find answers regarding your queries point wise below:
Query 1: When I edit the booking, I don’t have a section to edit:
Response: Actually, we are not quite clear with the query. Can you please provide us with screenshot of the section where you are willing to edit payment amount, trip price etc.
Query 2: I also need to know, if a customer makes a partial payment(Example: 30 %), how can he access to manage the remaining payment.
Response: Partial Payment add-on manage the remaining payment. After the partial payment is made, client will be able to view paid amount in booking detail section in user dashboard page and admin will able to view paid amount in booking section in backend.
Also, client has to pay remaining amount from user dashboard page.
Further, admin can manage the number of installments to be made by client and percentage of amount to be paid by client in multiple installments.