If you are looking to provide the discount according to the no of people available, then group discount is the right feature to add.
WP Travel Group Discount module included in WP Travel Pro allows the admin to add the prices which can be offered as the group discount based on no of people attending the trips.
Admin will be able to add the group discount for the category under the category section from the tab “Dates and Prices” of the individual trips.

After that, the user will be able to see the discount price offered on the trip by clicking on the link “View Group discount” on the trip single page under the “Booking” tab.

For detail assistance regarding Group Discount for the category under the category section, please once refer to the documentation link
Also, if you want to provide the group discount price per pricing instead of Category then worry not, WP Travel Pro v4.0.0 has come up with this interesting feature that includes the Group discount price feature underpricing options so that users can set group price per pricing rather than per category. The main purpose of this feature is to set group discount prices for similar types of categories once rather than setting group prices individually for different categories.
Admin Side:
After updating WP Travel Pro v4.0.0, you will see a feature regarding providing group discount per pricing option. To use the group discount per pricing feature, you have to enable Enable Group Price option under the Pricing option by going to Admin Panel > Trips > Add New > Prices and Dates > Prices as shown in the screenshot below

Client Side:
By clicking on the link “Discounts” on the single trip page under the “Booking” tab, the user will be able to view the discounted price per person in table format as shown in the screenshot below:

Note: You can either enable Group Price for Pricing under Pricing Option or Group Price for the category under the category section.
For detail assistance regarding Group Discount for the pricing under the pricing option, please once refer to the documentation link .
For more details regarding Group Discount Feature, please watch the given-below YouTube video.
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