Create an All or None (AON) Order
Mark an order as "all or none" to specify that the order not execute unless the entire order quantity is available and it can be filled in its entirety. This attribute can be applied to all order types.
To mark an order as All or None
Display the All or None field on your trading window:
On the Page menu, click Layout.
Open the Order Columns tab and scroll down to the Attributes section in the Available Columns list.
Highlight All or None and click the Add button.
Create an order (click the Ask Price to create a BUY order, or the Bid Price to create a Sell order).
Check the All or None checkbox to tag the order.
You can also apply order attributes from the Miscellaneous tab on the Order Ticket.
For an example of using an All or None order, visit the Order Types information page.