There are a few ways to do this:
Go to the reports module, select statistical reports, select subrental statistical report. Enter in your criteria. You can choose summary or detail.
Another way is to go to the Inventory module, select rental menu, select equipment rental history, checkmark include subrentals. You can then sort your data and export to excel.
There is also the Subrental Return list. From the Reports Module, select Management, select subrental return list.