1. SKU - It is a unique code of letters and numbers that help to effectively identify and organize your inventory.
2. HSN codes - It is used to classify goods to calculate GST. It helps in determining the tax slab (NIL, 5%, 12%, 18%, & 28%) of your product.
You can find both of them in the 'Product Details' section of 'Create Forward Order' page.
3. Eway Bill - Under GST Act, it is mandatory to enter Eway bill number for shipping of goods from one place to another, either inter-state or intra-state and of value more than INR 50,000. You can easily enter your Eway bill number while creating a manual order in Shiprocket.
To generate an Eway bill, please visit https://ewaybillgst.gov.in/Others/EBPrintnew.aspx