How to add a link to dawn theme product page but only on certain products

[Blended]

I want to add a sizing guide link to my products, different supplies have different guides so each would need to be specific. If I create a "page" with the relevant information for each brand size guide, how do I insert the link to the product? 

Thanks! 🙂 

[ThePixelEdge]

Helo @Blended

Your requirement entails custom development, which necessitates paid services. Please inform us if you are open to discussing this further.

[Blended]

Yes im open!