Hi,
Yes, Odoo does support the use of multiple currencies, including parallel currencies. You can define additional currencies for your company and use them for various financial transactions, including GL, AP, AR, and fixed assets.

To enable the use of parallel currencies in Odoo, you need to do the following:

1. Activate multi-currency accounting: Go to the "Settings" menu, click on "Accounting" and then click on "Configuration". Check the box for "Allow multi-currencies" and save the settings.

2. Add new currencies: Go to the "Accounting" menu and click on "Currencies". Click on "Create" to add new currencies, and enter the required information such as currency code, name, and exchange rate.

3. Define currency rates: Go to the "Accounting" menu and click on "Currency Rates". Click on "Create" to define new currency rates, and enter the required information such as currency, rate, and date.

4. Set up parallel currency for your company: Go to the "Settings" menu, click on "Companies", and select your company. Under the "Accounting" tab, click on "Advanced settings" and then check the box for "Use a secondary currency". Select the currency you want to use as the parallel currency and save the settings.

Once you have set up parallel currency for your company, you can use it for various financial transactions in Odoo, including GL, AP, AR, and fixed assets. You can also view reports in both the local currency and the parallel currency.

Refer this official documentation by Odoo for more details:
https://www.odoo.com/documentation/16.0/applications/finance/accounting/others/multi_currency.html

Hope this will help you

Thanks