On the Quote, Invoice, Purchase Order, Sales Order create or edit page, you add individual products in the Product Details section. This section also contains other details like the List Price, Quantity, Amount, Discount, and Tax. Every product and the corresponding details are called product line items.

1. Adding product line items while inserting a quote (through the Insert Records API)
   
2. Updating a quote by adding another product line item (through the Update Specific Records API)
   

• The discount on the product is automatically applied based on the range you specified in the price book.
  
• The cumulative tax (specified for the product) is automatically calculated based on the amount (after the discount).
  
• The List Price of the product specified in the associated price book is automatically taken for calculating the amount.
  

• For Product_Details
  When you have associated a price book with an inventory module, and you include the key and value for Discount inside Product_Details, this discount value overrides the discount calculated from the price book.
• For line_tax
  You must specify the percentage of tax in every JSON object inside the line_tax array.

• Pass the IDs of the line items you want to retain as individual JSON objects.
  
• Add the new line item with the required details as a new JSON object.
  
• Do not include any details about the line item you want to remove. When you do not specify the ID of any line item, the system deletes it automatically.
  

• You can add a maximum of 200 line items to an inventory module.