IB offers Fund Investment Managers in a Multiple Fund Account a number of ways to allocate trades across multiple accounts based on a single order entry:
You can select an Account Group, which comprises a pre-defined subset of accounts and an associated allocation method. The Account Group allocates shares based on a ratio calculated by the system, or by a percentage. The numbers used to calculate the ratio derive from the method you chose when you created the group, or by the percent change you set.
A second way to allocate shares is through an Allocation Profile, which distributes shares to each account in a profile based on a percentage, ratio or absolute number that you define. Both of these methods require that you create a group, assign accounts to the group, and define the group's allocation method.
You can also direct an order to a single account by selecting that account number or alias from the Allocation field on the order management line, or to all accounts by selecting All from the Allocation field. Set a default allocation from Global Configuration.
For more information
To learn more about allocating trades across multiple accounts, see the Pre-Trade Allocations section of the TWS Users' Guide.