If the permanent exchange rate for transactions ready in QB online? We don't want to update exchange rate until we want to change the rate.

Let me share some insights on how exchange rates work in QuickBooks Online (QBO).

The exchange rate is the number of home currency units to one foreign currency unit. QBO uses exchange rates to show how much a foreign currency transaction is in your home currency value. Where the foreign currency values are automatically updated every 4 hours in QuickBooks from Wall Street On Demand. Then the program then downloads and uses exchange rates from IHS Markit, an information services company. 

Since you don't want to update the exchange rate until you change it, we can manually enter your own exchange rates to use them for foreign currency transactions. Here's how to enter them on your QuickBooks Online (QBO) Essentials, Plus or Advanced version:

1. Click the + New, then select the transaction you want to enter.
2. From the ▼ dropdown, choose the Customer or Vendor.
3. In the Rate field, enter the exchange rate.
4. Complete the transaction details, then press Save and close.

To use your rate for multiple foreign currency transactions, just update the rate in your currencies list. The program uses your new exchange rate for foreign currency transactions you enter for the day.

1. Go to the Gear icon, then select Account and settings.
2. Click Advanced.
3. In the Currency section, choose the Manage Currencies link.
4. Find the exchange rate you want to update and select Edit currency exchange in the Action column.
5. Press Save.

We can use the exchange rate for the whole day and re-enter it if you want to use it again. Once you save the changes, the currencies list shows the date and time it was updated, the new exchange rate, and who made the update. You can check out this article for more details about exchange rates for foreign currency transactions: Learn about exchange rates in QuickBooks Online.

Let me share this article for additional information: Set up and use Multicurrency in QuickBooks Online. This provides an overview of how to add or delete currencies, enter the exchange rate, and add foreign customers or suppliers to name a few. 

I'm just one post away if have any further questions regarding exchange rates or any multicurrency-related concerns. I'll be here to help you out. You have a good one.