Create an Iceberg/Reserve Order
An Iceberg/Reserve order allows you to submit an order (generally a large volume order) while publicly disclosing only a portion of the submitted order.
To create an Iceberg/Reserve order
Show the Display Size field on an order management line:
Right click in the column headings and select Customize Layout.
Click the Order Columns tab.
In the Available Columns list, open the Quantity category and select Display Size.
Click Add to move the column to the Shown Columns list.
On the trading screen, create an order (click the Ask Price to create a BUY order, or the Bid Price to create a Sell order).
In the Display Size field, enter the quantity that you want publicly disclosed.
For a more detailed description of iceberg/reserve orders visit the Order Types information page.