By default, all trades on the same underlying with the same side are grouped and displayed as an average price trade. You can create a custom Average Price trade on any subset of trades with the same underlying and side.
To create an Average Price trade
An average price trasade line is created in the Trades matrix. Note that if you elect to allocate an Average Price trade, the Allocation Summary will display a single allocation. If you elect to individually allocate the components of an average price trade, the Allocation Summary will display a group of allocated trades. In the preceding figure, the default Average Price trade for 200 IBM has been expanded to show the leg trades. We’ve selected three to create a new, custom average price trade.