Available when USD is used to define the quantity type. If checked, the allotted USD amount is allocated amongst orders based on the percent value you enter in the % field of an order line. To use this feature, you must enter a value in the % field for every order in the basket, and they must total 100%.

If unchecked, the USD amount is allocated equally amongst all of the orders, based on the number of orders in the basket. For example, if $50,000 is allotted to a basket of 50 orders, each order is allocated $1000.00 USD (2% of the value) to determine the number of shares bought or sold.