The Supplier Backlog management application: SBM can be used for this. More information can be found here: SBM

You can add a filter to find lines that have a certain percentage free, or if they are confirmed late / early to stock compared to what they are linked to (HiLoSTock).

Adding for example 50 to 'Pctfree' lists all orders where the free quantity on the item is 50% or more.
You can add an Amount to filter out links with value over a specific amount if this is required, or add an MFR/code to get a list of specific products.

This list can be downloaded as a csv file using the option: Download SBM to CSV file.