You must first have exported an assessment or assessment definition as a file if you want to import it.
To import an assessment or assessment definition:
In the Look In field, type the location where you saved the exported assessment definition, or click Browse to find the exported file. Look for files with extension .aef.
In the Import As Assessment Name field, supply a name for the imported assessment definition. Or choose the name of an existing assessment from the list. If you try to import the assessment with the name of an existing assessment, you are prompted to choose another name.