You can add a list of parts to your BrickOwl Wishlists with the following steps:
1. First you need a BrickOwl API key (a one-time process). Go to your BrickOwl profile
page and click the API Keys tab. Then click the 'Add API Key' button.
2. Click the 'Add to your BrickOwl Wishlist' on any 'Buy these parts' table.
3. Enter your key when prompted and click the 'Get My Wishlists' button. Rebrickable will remember the last key you used and default it in for all future uses.
4. Select the Wishlist you want to add parts to, or create a new one by entering a name into the available input box.
5. Click the 'Add parts to Selected Wishlist' button.