WP Travel Partial Payment is the module that is included in WP Travel Pro plugin that provides better control over how you collect payments by allowing your customers to make payments for the remaining parts via the payment gateway that they prefer
Admin Side:
After activation of the WP Travel Pro plugin, enable the Partial Payment by going to, Admin Panel > WP Travel > Settings > Advanced > Modules Settings.

Now by going through Admin Panel > WP Travel > Settings > Payment, you can add any number of installments to be made by the customer and set any percentage(%) of the amount to be paid as per your requirement in multiple installments.

Then, make sure you have added the Dashboard Page using the shortcodes ‘ [wp_travel_user_account] ‘.
After, that assign a dashboard page. For detail, please refer to the link attached.
Note: To receive the remaining payment from the user you have to enable the login/register option before the user books the trip.
After enabling Partial Payment, an additional payment option, Partial Payment will appear on the checkout page.
Also, WP Travel Pro provides the feature of sending a reminder notification to the customer via email about the remaining partial payment to be paid before going on the trip.
Client Side:
After the booking is done with the partial payment, the rest of the payment procedure is made easy with the plugin.
To make the payment of the remaining amount, go to User Dashboard > Bookings. You can find the details of the individual booking

Click on the detail of the individual trip to make the remaining payments.

For more details regarding Partial Payment, please watch the Youtube video