How do I create and assign a product guide (like a size chart) to a product option?

You can create a guide (such as a size chart) and then assign it to a specific product variation.

Create a guide

1. Go to Store > Settings > Configuration > More.
2. Add your guide (e.g., size chart).
3. Enter an Inside Name (for your records) and a Display Name (shown to customers).
4. Use the text editor to add your guide content.

Assign the guide to a variation

1. Return to the product’s Options tab.
2. Click the variation you want.
3. Choose your guide from the Guide Field dropdown.