Hi,
Refer the blog
https://www.odoo.com/documentation/17.0/applications/finance/fiscal_localizations.html

In Odoo, changing the fiscal localization from Taiwan (TW) to Hong Kong (HKG) involves configuring the accounting settings and updating the fiscal position. Here are the general steps to achieve this:

1. Log in to Odoo: Access your Odoo instance and log in with the necessary credentials.
2. Navigate to Accounting Settings:
   • Go to the Accounting module.
   • Look for the Configuration menu or a similar section, which typically includes accounting settings.
3. Update Company Information:
   • Find and update the company information related to your organization, especially the address and localization settings.
   • Change the country to "Hong Kong" (HKG) and save the changes.
4. Update Fiscal Position:
   • Go to the Accounting > Configuration > Fiscal Positions menu.
   • Locate the fiscal position that corresponds to Taiwan (TW).
   • Edit the fiscal position and update the country to "Hong Kong" (HKG) or create a new fiscal position for Hong Kong if necessary.
5. Update Taxes:
   • Review and update any taxes associated with the fiscal position. This includes updating tax rates and rules applicable to Hong Kong.
6. Review Chart of Accounts:
   • Check if your chart of accounts is suitable for Hong Kong's accounting requirements. Update account names, codes, and mappings if necessary.
7. Check Currency Settings:
   • Ensure that the currency settings for the company are appropriate for Hong Kong. Update the currency if needed.
8. Review Other Configuration Settings:
   • Check other configuration settings related to accounting, such as payment methods, journal entries, and payment terms, to ensure they align with Hong Kong's accounting practices.
9. Test Transactions:
   • Perform test transactions to verify that the changes made do not result in errors and that the accounting entries are correct.
10. Update Reporting:
    • If there are any statutory reports or financial statements, ensure that they are configured to meet the reporting requirements of Hong Kong.
11. Consult with Accounting Experts:
    • If you are not familiar with the specific accounting and taxation regulations in Hong Kong, consider consulting with local accounting experts or authorities to ensure compliance.

Hope it helps