i want to port my brother's number with koodo right now he is with bell, i am already a koodo customer for more than a year so if i add that to my account, do i get any discount or do he gets any off on his plan
Since he'd be choosing from the new plans, those plans include a discount for bringing your own device. So assuming that you're planning to use the phone he already has, you'd benefit from that discount. There are no other discounts.
You're also eligible to get yourself and him a referral credit. Search for referral credit in the FAQ to find out more.