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I am working on magento 1.9 community edition website.
I want to add a feature in product page such as additional product at extra cost.
Such as if there is a dress worth 500₹ and a belt option is given at product page so that when clicked on that checkbox the additional value ( already assigned ) is added to final.
The feature you mentioned is already present in magento in the form of custom options.
Here is official merchant doc, with step by step procedure to add custom options - https://docs.magento.com/m1/ce/user_guide/catalog/product-options-custom.html
