hey, i'm not too sure about bcomm and beco but this is pretty similar to what im doing, im doing bcomm/bsc, normally ud just do 1 major for each degree if you're doing a double degree however the uni does allow a triple major if you're eligible. In my case i asked the department after first year and apparently my scores were good enough for do a double major in bcomm, i'd have to overload next sem though, so yeah go ask the department and they should let u know ur options. It differs for each major i think, in my case i've overloaded a unit for each of last semester for my actuarial studies major however it helps that finance and actuarial studies units do overlap quite a bit, so i'm not too sure on your majors. I do suspect though that finance and econometrics overlap quite a bit too and you won't need to overload too many units.