Thank you for clarifying @legalfalconA file can be transferred to any visa office across the IRCC network. See https://www.canada.ca/en/immigration-refugees-citizenship/corporate/publications-manuals/operational-bulletins-manuals/service-delivery/file-transfer.html
The primary office is the which is responsible for the file or where it originated and will be issuing the COPR, whereas the secondary office is where your file current is being processed.