You can add different prices for multiple categories like an adult, child, infant, etc. for a single trip using WP Travel free version. If you are willing to add different prices for multiple categories then you have to add a separate pricing option for different categories.
To set different prices for different categories like child, adult, infant, etc., you have to click the ‘Add Price’ button under the Prices & Dates section.
Also, You can add a pricing category by going to Admin Panel > Trips > Pricing Category
For detail assistance regarding adding different prices for multiple categories, please refer screen record.
Further, if you have any queries, please submit them to our Contact page.