Yes, it is possible to add different prices for different categories like a child, adult, infant, etc. for a single trip using the WP Travel Pro plugin.
WP Travel Pro plugin comes with multiple pricing options from which you can add different prices for a different category. To set different prices for different categories like a child, adult, infant, etc., you have to click add new button in the backend section.
You can add pricing category by going to Admin Panel > Trips > Pricing Category
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