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https://wwwapps.tc.gc.ca/saf-sec-sur/2/cawis-swimn/wsdrs_reg.aspx
The AMO/AOC registration option only allows for 1 userid under a given number, though an organization can ultimately have multiple users.
Subsequent registrations for a given organization need to be done by either
i) User #1 – the first person to register with that number is deemed “SDR manager” for that company – or
ii) Anyone else within that Organization where the Manager flag is set to “Yes” – or
iii) by a Continuing Airworthiness user, normally the Technical Inspectors in the SDR section, or the CAWIS Business manager