Perform the following steps:

1. Open the Nessus Web Client.
2. Log in to the Nessus client with the user that you created during installation:

3. Click on the Policies option on the left-hand side of the home screen, under RESOURCES, to see the Policies screen:

4. Click on Create a new policy and on Basic Network Scan:

5. Fill in the details for Name and Description, as follows:

6. Set the group permission to Can use.
7. Navigate to the DISCOVERY tab and select the type of port scan to be performed from the drop-down:

8. Navigate to the ASSESSMENT tab and select the type of assessment to be performed from the drop-down:

9. Navigate to the REPORT tab and select the settings for Nessus to prepare the report as per your requirements:

10. Navigate to the ADVANCED tab and select the scan settings as per your requirements from the drop-down:

11. If you select Custom, a new tab General will appear below the ADVANCED tab so that you can further customize your scan settings:

12. Save the scan. This will take you to the Policies screen from Step 2, which lists the current policy that you created:

13. You can check the checkbox beside the name of the policy and click on the More drop-down at the top right to select from the Copy, Export, and Delete options for the policy:

14. Take note of the previous step and click on Export to export the policy onto your system:

15. Click on Export. A .nessus file will have been downloaded onto your system:

16. In order to import this, click on Import and upload the downloaded .nessus file:

17. The uploaded policy is now visible in the Policies screen of the user: