If you'd like to see which items are 'In Use' within a custom date range all you have to do is navigate to the Inventory tab and put in the dates you'd like to search in the Start Date and End Date area.
Once you've set a date range, you'll then see two columns:
In Stock (how many you have ready to go in this range)
Quantity Booked (how many are added to signed contracts in this range)
Max Needed (the highest amount needed on signed contracts in this range)
Add more columns to find out which items are Booked, Gross Revenue, and more! Learn more here.