customize existing wordpress/woocommerce plugin's output on product page

First time try out wordpresss/woocommerce. learning and trying to make everything work. but stuck here. Bought a plugin (custom made) but need to customize the way it output data on woocommerce prduct page. Plugin retrieve some products details from API Server and show it on my produt pages as dropdown list. But list is long and user have to scroll through all list to chosse what they need. I want this drop down to be shown like a search field with autocomplete My site behaviour: [login to view URL] Needeed behaviour: [login to view URL]