Dynamic Pricing + Product Add-ons

gistfile1.txt

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) { 

    foreach ( $cart_object->cart_contents as $key => $value ) {    
        $addons = $value['addons'];
        
        $add_to_price = 0;
        foreach($addons as $addon) {
            $add_to_price .= $addon['price'];
        }
        
        $price = $value['data']->price;
        $price += $add_to_price;
                
        $value['data']->price = $price;
    }
}

@kemmieg
I just came across this thread. Gravity Forms Product Addons does this automatically if you select the "Enable Dynamic Price" when attaching a form to a product. It was an option I added in early 2016.