Unfortunately you can’t merge prepaid accounts at all… that only works for postpaid accounts. You could add the lines to your Koodo (or Telus) postpaid account but that depends on their usage.

That’s exactly what I am hoping to do. Merge the two prepaid numbers into the post paid account. How do I go about doing this?

You would need to open two additional lines on your own postpaid account. Once those are set up and once you receive the postpaid SIM cards, you can port your prepaid numbers into the new postpaid lines.