When in Inventory Asset Management (IAM) mode, you can unreserve specific inventory-tracked items you reserved for the project.
1/ Go to the Project details view.
2/ Go to "Details > Item Status" in the details view, in the Ordering or Scheduling view.
If you want to filter items to only inventory-tracked items, you can use the Inventory Items filter.
3/ Select the inventory-tracked item you want to unreserve and click "Order" or "Schedule" in the top-right corner, and click "Manage inventory assets."
4/ Set "Show Reserved Only" to Yes to see the specific assets that are reserved.
5/ Deselect the checkboxes to the left of the assets you want to unreserve.
6/ Click "Reserve selected."
This will reserve only the selected assets. If all assets are deselected, all assets are unreserved from the project's location.
The following screenshot shows how 2 of the 3 assets can be unreserved from a project.
8/ Do this for all assets you want to unreserve.