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1) https://www.interactivebrokers.com/en/software/tws/usersguidebook/specializedorderentry/create_a_combination_order.htm 2) https://www.youtube.com/watch?time_continue=47&v=4suN5RPR6ow&feature=emb_title Don't use mosaic. Use the traditional TWS tab. Enter the combo in one of the rows. The row under you want to put the other combos or legs. It is definiteley possible as I used the feature all the time, can't imagine they have removed it.

It doesn't work well with hedged straddles though. At IB I used to put a sell GTC order for the whole straddle plus strangle with 15% target and next to that two individual orders for the short call/put with order to close for 0.05. If one of the three executed, the rest would cancel. Whereas now with tradier I can only put one order because you can't have two seperate orders for the same leg. Emailed them about it but they say its just the way it is, incredibly unlogical. So lets say you have one short call position (-1) And one order for buy to close (+1) You can't have another buy to close (+1). I don't understand the logic as the worst case scenario would be that both orders go through and you will just be long one call. No risk for the brokers whatsoever.

@drcrc, Interactive Brokers does support OCA orders for option combinations. You can submit several combo orders (profit target, stop loss), and set "One Cancel Another Group \ Group Name" in the order ticket to the same group name for every order (for example, set OCA Group to "111" for both profit target and stop loss orders). There is also "OC Grp" column in watchlist. Note that you can only modify "One Cancel Another Group" in the order ticket before the order is submitted to the exchange. After order is submitted, with empty "One Cancel Another Group", you can not longer modify this field. Slightly inconvenient, but that is how it works.