Consonance stores your list of unused ISBN13s so it can allocate them to new products.
1. Go to the ISBN import page
2. Paste your list of ISBN13 in
Copy and paste your list of ISBN13s (probably from Excel) into the box
3. Add the imprint
Add your imprint from the dropdown
4. Save
Click Save to see a list of unused ISBNs, which will be selectable on your works’ metadata pages.