How Can I Transfer My Thai Visa to My New Canadian Passport?

I got a new Australian passport in January. Immigration in Chiang Mai moved the information over to my new passport showing how I had previously entered the country prior to getting my non O and the date that I entered (small stamp), the date that I applied for my Non O and it's past validity period (small stamp), the date I applied for my most recent 12 month extension and it's valid to date (small stamp) and another small stamp showing the date that my extension would finish. And two half page stamps ie the first one showing details of my old passport ie passport number and date of issue and date it was cancelled. The second half page stamp was a copy of my current 12 month extension including the date it was approved last year and the date it would finish this year. So effectively these stamps in total took up two pages of my new passport, but the process was quick and easy and did not require that I pay a fee or bring my old passport with me when I travelled in and out of the country in February

Seems to be the same as an Aussie passport.

Get the new passport, visit your friendly local immigration office and get all the relevant stuff transfered. Cost was 500 TBT in Udon thani.

Did it back in December 2019.

You get a letter from your Embassy and with that letter and both passport you visit the immigration Office and they will transfer the Extensions of Stay, Original visa stickers can not be transferred so as long as they are valid you use two passports