How to add different size chart for each product?
You can set different size for each product by product metafields.
The first you need install this extension on your chrome by go to this link: http://shopifyfd.com/
Now go to product page, you need click to ShopifyFD icon and metafield will show
Now create metafields as below
value: image or html code
Don’t forget to click save button
If you don’t add data here, global data will appear in page (same data for all products) which you can add from customize >> Product Page >> Scroll down to “Show Tab 3“