Before you transmit a combination order, carefully review your order parameters on the order management line, or from the Order Ticket window by clicking Accept.
From the market data line, click the "Ask" or "Bid" price for the combination order you want to create.
Click the Ask Price to create a Buy order.
Click the Bid Price to create a Sell order.
On the Order Management line, modify order parameters, if needed.
Note on Pricing: If you buy a spread and you owe cash (debit spread), enter a positive limit price. If you buy a spread and you receive cash (a credit spread), you must enter a negative limit price. Conversely, if you sell a spread and receive cash, enter a positive limit price. If you sell a spread and owe cash, you must enter a negative limit price.
For example, an April 20 xyz call shows a BID price of 6.60 and an ASK price of 6.70. An April 30 xyz call shows a BID price of 0.15 and an ASK price of 0.20.
If you buy a "debit" call vertical spread with the following legs:
Buy 1 OPT APR02 20.0 CALL (6.70)
Sell 1 OPT APR02 30.0 CAL L (0.15)
For this transaction you pay: 6.55 (a debit transaction)
If you buy a "credit" call vertical spread with the following legs:
Sell 1 OPT APR02 20.0 CALL (6.60)
Buy 1 OPT APR02 30.0 CALL (0.20)
For this transaction you receive 6.40 (a credit transaction; enter a negative limit price).
Transmit the order.