if you can not find places for institution number and transit number in the form,then you can put all of them together with account number.
010 is institution number(which is CIBC), transit number denotes the branch where your account is held, then follow by account number, so format 010-bbbbb-XXXXXXX is reasonable, but I think bbbbb-010-xxxxxxx will work too because anybody work in bank knows the three digits number is institution number and so on.