Characteristics values taken from specifications

-- HikaShop version -- : business 2.3.3
-- Joomla version -- : 3.4.1

I want to make this possible, to specify more values in "specifications" ,and to show up in product page a Characteristic dropdown with values taken from specifications.

You can see in this image what i want to do.

Hello,
Can you give me more information on what you want to do ? what kind of dropdown do you want and for what purpose ?

I might create a dropdown that contains the values from specifications, the customer select one value when he add an order, and i want that selected value to appear in command and on invoice.

Hi Mohamed,
Item custom field do the job, but partial for what i want.
I need to create the item custom field with all values possible (1,2,3,4... 30) added, but in my product page i dont want to have all values visible.
For product 1 i want to have only this values: 05, 12, 19, 26 .
For product 2 i want to have this values: 02, 08, 15, 21.

So how can i make the custom item field to take the values from "Specifications -> Size"
If for product 1 "Specifications -> Size" are : 05, 12, 19, 26, the values from item custom field to be 05, 12, 19, 26 ;
If for product 2 "Specifications -> Size" are : 02, 08, 15, 21, the values from item custom field to be 02, 08, 15, 21 ;
Can i do that ? What file i need to modify if is needed?

See my example here: https://jsfiddle.net/jx596bhv/3/

How can i add a new column in backend to Order listing? The fiel type is "item"


I tryed with this code, but is not working in this situation:

<?php $class = hikashop_get('class.product');
$productData = $class->get($product->product_id);
echo $productData->days_custom;
?>