1. Log into backend
2. Go to Component --> Hikashop
3. Go to Products --> Characteristics
4. Click "New"
5. Fill in the name, and click "Add" for option value
6. Once done, click save & close.
7. Go to Products --> Products
8. Looking for "Add-Ons" on the left side, click on it
9. Click "New"
10. Key in the Name of the selection, and make sure categories is Add-Ons
11. Scroll down to Specifications tab, select characteristic to the one u created, can choose the default value.
Example as below, click "Save"
12. Change Product Selection (checkout for multiple select or radio button for single select)
13. Once save, there will be a new tab "Variants", click on it
14. Click "Add variants" and select option.
15. Click Save
16. Click "Edit" icon
17. Key in the option name, add SKU under Code
18. Add price (can skip if do not have price)
19. Click Save
20. Click Save
21. Done to create option for selection.