What are Subaccounts
Subaccounts provide the ability to segregate trading activity from your main account. Since PowerTrade accounts have portfolio margin enabled by default, creating subaccounts allows you to isolate your positions and margin balances.
How Many Subaccounts can I have?
There is currently no limit on the number of subaccounts you can create under your main account, but only your main account may have subaccounts — subaccounts cannot be nested under subaccounts.