Shekhar, the spread order window is used for hyou have to put your price as the difference between the two contracts. For example, if you want to buy the Nifty spread and the price difference between the two calendar months is 40 points, you have to put 40 as the price in the price window.
2. You can choose the type of order you want:
a. Spread (calendar): This by default chooses one buy and one sell.
b. 2L: You can choose to buy or sell both legs.
c. 3L: You can choose to trade three legs at the same time.
3. Once the order is chosen, decide the quantity and the price. If it's not a spread order, then you have to put the price for each contract individually.
4. Click on submit and you're done.
IOC means Immediate or Cancel
All spread orders are NRML in nature.
Hope this information helps.
Hari