>Unless I'm missing something, paying an extra 12 commissions >doesn't seem to be worthwhile just to save some record >keeping. imo you are missing something. manuall record keeping will probably cost more in errors and slippage than you save in comm. also one cannot get real time track record of each model. not sure what the original poster question is as i have had multiple accounts with ib. had to open a separate instance of tws for each. or was the q about subaccounts managed from one interface?