extra price

Add Custom Price in your woocommerce cart before calculate

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Fixed Custom Value you want to add in All product


add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );
function add_custom_price( $cart_object ) {
   $custom_price = 100; //Custom price you want to add
   $value['data']->price = $value['data']->price + $custom_price;
}

Add an Extra Cost ( 10% of Actual Price ) based on SIZE Attribute


add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) {

    foreach ( $cart_object->cart_contents as $key => $value ) {

        $p_size = $value['variation'][attribute_pa_size];//Get Attribute size

	if($p_size >= 44)
	{
		$c_price = $value['data']->price;
		$cp_10 = $c_price * 10/100; 
		$value['data']->price = $value['data']->price + $cp_10;
	}

    }
}

It just an example you can use any attribute or any condition