Yes, you can absolutely use your trade credit for multiple orders as long as it is still available at the time of purchase. If you only use a portion of your account credit limit, you can save the remaining credit for your next order.
It's important to note that if you make a payment or pay off your entire balance earlier than expected, that amount will become immediately accessible for future orders. And don't worry, even if you want to make a purchase that exceeds your credit limit, you can still do so by paying the difference upfront during checkout.