When you delete the import process, you delete only the process status record that contains the import file that was used and any format options you set. You can still use the batch that contains the data imported into your database from the import file.
You can delete an import process from the Import page in Administration. In the Import processes grid, click the double arrows next to a process to expand its row. On the action bar, click Delete.
Tip: You can also delete an import process from the import process status page. Under Tasks, click Delete process.