These types of data can be imported:
First select a file to upload.
You will be prompted with a list of fields to match to the csv headers or the data in the first row, select the matching option for each field you intend to import. Select whether to overwrite existing records with the same name or reference. Enter the line number on which the data(not including the headers) begins in the csv file. Press import to continue.
You may be prompted about the limitations of your subscription if the data to import exceeds your usage allowance.
Finally you should be prompted indicating the number of successful imports.