Is there a way to convert sage50 canadian edition to quick books help please

Call and ask Intuit Data Service to convert it

https://quickbooks.intuit.com/learn-support/en-ca/getting-started/import-from-quickbooks-desktop-and...

Make sure you have open your QBO account

https://quickbooks.grsm.io/Canada

Another option, consider purchasing a 3rd party conversion service. They may convert your data file to QB Desktop file, then you may self migrate it to QB Online. You may keep that QB Desktop data file for archive.