You can remove multiple imports you've made into your analytics module by following the directions above.
To remove imported Other Assessment uploads, navigate to the tile of the assessment with uploads you wish to delete, click the three dots in the corner, and click Manage Uploads.
Pick the assessment within the company you wish to delete data for, and click "Manage Data" in the applicable row.
Delete a single attempt name by clicking the trashcan that appears when you hover over it. Delete multiple by clicking a number of boxes and then Delete Multiple Attempts.