Hi.. There is no separate form for Can + , so stop searching for it .. If you have previous travel to canada or hold a valid US visa... travelled or not travel doesn’t matter but it should be valid. If you are applying online the system would pick it though the questionnaire and if you are applying through VAC, kindly ask them to check the proof of ur travel or visa to US. They would mark it as CAN +. As far as the processing goes.. it’s for the visa officer to ascertain it as a Can + or a Regular trv. Thanks