if you get another sim card for your car, you would have to ADD it as a new line to your account. you would have to ask Rogers if you can "share" your data bucket with a new sim card which would have its own number and you would pay an additional monthly fee for.
its the same concept for people who have those lte tablets, some times if ur plan is not sharable you would need the new sim/line to have its own data bucket, the only way to find out is to call a customer service rep and ASK. cus it depends on your current plan and if they offer such feature and we dont know what plan you have.