Price by piece or by m²

Hi,

It depends how you want to handle it. You could use a characteristic to let the user select the number of m². If it's just about changing the text, that could be possible but you will have to edit the file listing_price of the view product via the menu Display->Views and change the code there in order to display the prices differently based on the products.
You can do something like this:

switch($this->row->product_code){
 case 'my_product1':
 case 'my_product2':
  //display price in one way
  break;
 case 'my_product3': 
  //display price in another way
  break;
 default:
  //default
  break;
}

You would have to create first one category per type of product. Keep it unpublished if you don't want it to be seen on your front end. Then, when creating/editing a product, you can add one of these categories as a second category of your product. Then, you can create custom fields of the table "item" and limit them to one of these categories.
Then, you would have to create a quantity price calculation override as explain there:
www.hikashop.com/support/documentation/6...tation.html#override
That way you could change the price based on the value entered in the custom fields by the customer.

So yes, it's possible, but not so simple.