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17 hours ago, Nishith said:

hi..
can you develop custom module ? if you develop custom module then register hook with your module "ActionProductSave" and use same like above your module file.
if you need store the price then you need create the custom table using you module install method.

 

public function hookActionProductSave($params)
  {
  	$former_price = $params['price']->former_price;
  }

 

Read this i hope you better understand 
http://nemops.com/prestashop-products-new-tabs-fields
Thanks

Thank you for your reply,  I'm going to take a look at it