You need a shopify expert to add the functionality to enhance the website.
Relevant Skills and Experience
BigCommerce, HTML, PHP, Shopify, Volusion, Shopify Custom Features, Scripting and App Development,Product upload / Inventory setup services using CSV files,Shopify theme customization
Proposed Milestones
€29 EUR - to add the functionality.
what functionality you want to add and let me know your availability of time?