To enable Multi currency feature and record sales order in multi currency, you need to follow these steps:
Step 1: Open your company, then, go to the Administration tab and click on Configuration.
Step 2: Select Features / Options and then click on the Accounts tab.
Step 3: Here, you will find the Multi Currency option. Just click on the checkbox to turn it on.
Step 4: Next, you need enable Multi Currency feature in the party master.
Step 5: Now, you can create sales order from the transaction menu with multi currency.