There are a few ways to do this on Zalyn.com. Try it out to see if it works for you.

1. Signup for a free account on Zalyn.com. Login & then click the + icon on the top right corner of your browser window.
2. On the Add Coupon page, enter your coupon (BCD) details (repeat to add all your coupons).
3. Click on your profile pic on the top right corner of your browser and click Profile. Now click the Coupons tab & you'll see all the coupons you added.
4. Hit the SELECT button for the coupon you want to use. You'll see a popup asking you for your rental details. Enter your information & it'll be sent to Priceline along with your BCD code. When you click to use another coupon, it'll remember your rental details & you won't have to type it in again.
5. When you get to Priceline, you'll see rates based on the BCD code you used. In addition to your preferred pickup location, you'll also see results for nearby locations.

If you want to test it out real quick, you can use a collection I recently created https://zalyn.com/#user/sorabb/collections/budget-bcds.