How can I list all <"Product Name", "Quantity","Unit Price"> rows for a CRM sale order in my Creator application?

How can I list all <"Product Name", "Quantity","Unit Price"> rows for a CRM sale order in my Creator application?

Through  https://zohocrm.wiki.zoho.com/Managing-Standard-Fields.html, I know CRM "Sales Orders" module has defined following fields.

Product Name * Select the product name.This field is mandatory Lookup -
Quantity in Stock Displays the stock quantity. Numeric Integers
Quantity* Specify the quantity for which the sales order has to be generated. This field is mandatory Numeric Integers
Unit Price* Displays the unit price of the product. Currency

However, since one sale order contains several <"Product Name", "Quantity","Unit Price"> rows, the "Product Name" field value for one sale order means what? a list of all name of products referenced by this sale order?

I've following code in Creator:

  1.     saleOrders = zoho.crm.getRecords("SalesOrders");
  2.     for each saleOrder in saleOrders
  3.     {
  4.         productNames = saleOrder.get("Product Names");
  5.         quantities = saleOrder.get("Quantity");
  6.         unitPrices = saleOrder.get("Unit Price");
  7.     }

But the running results of productNames/quatites/unitPrices are all just null.

How can I list all <"Product Name", "Quantity","Unit Price"> rows for a CRM sale order in my Creator application?