Let me help you create a dollar invoice and make Dominican peso to show the exchange rate.
To achieve your goal, the Dominican peso should set up as your Home currency. Here's how:
Go to Settings ⚙, then select Account and settings.
Select Advanced.
From the Currency section, select Edit ✎.
From the Home Currency ▼ drop-down, select your currency.
Click Save.
Please make sure to turn on the Multi-currency feature so you can set up a Home currency. Then, add the dollar currency, create a customer, and assign the dollar currency to the customer. Please browse these articles below as your guide.