To map the shopify product type with jet category follow the below steps:-
Go to Products->Map category page.
Choose the correct jet category respected to your shopify product type.
After mapping the shopify product type with jet category , click on the "Submit" button.
We recommend you to map all the shopify product type with Jet category.
Please once go through the below shared Doc(how-to-sell-on-jet-com)
https://shopify.cedcommerce.com/jet/how-to-sell-on-jet-com#sec3