How do I add multiple fields to the product module

How do I add multiple fields to the product module

Product module
How do I add and show the parts of the product code, manufacturer code, product stock ?

The code that works in the module on my Virtuemart site is as follows
i changed the codes for joomshopping on the new system but it didn't work

Virtuemart
<div class="item-title ">
<?php echo $item->product_in_stock; ?>
<div class="product-stock"> <?php echo $item->product_in_stock ?>
</div>
I will be glad if you help me
Joomshoping
<div class="item-title ">
<?php echo $item->JSHOP_QTY_IN_STOCK; ?>
<div class="product-stock"> <?php echo $item->qty_in_stock?>
</div>

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Aw: How do I add multiple fields to the product module

product code: $item->product_ean
manufacturer code: $item->manufacturer_code
product stock: $item->product_quantity

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Aw: How do I add multiple fields to the product module

Thanks for your help Admin
product_ean and product_quantity are working
but manufacturer_code not working
<?php echo $item->manufacturer_code; ?>
<div class="item-manu"> <?php echo $product->manufacturer_code ?></div>

Aw: How do I add multiple fields to the product module

module name?

Product with manufacturer_code?

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Aw: How do I add multiple fields to the product module

Module name : mod_sj_jshopping_listing_tabs

Manufacturer code is checked in joomshopping configuration product settings

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Aw: How do I add multiple fields to the product module

mod_sj_jshopping_listing_tabs - We are not the developers of this module

manufacturer_code - Not retrieved from database.

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