Beacon has a report specially built to help you track inventory velocity and plan your reorders - the Inventory Reorder Report!
Navigate to the Reports page and open the Inventory Section.
Click on the Inventory Reorder report
Select a Date Range
If required, exclude inventory that is soon to expire.
The resulting report will give you a calculation of your sales velocity in the given date range, high level stock levels, and based on current velocity the number of weeks before reorder.
To export, Click on the Kabob menu in the upper right corner of the report table titled, "Tile Actions", then select "Download"
Then select the Advanced Settings:

