To import Configurable product with simple product follow the steps below

1) Navigate to System > Improved Import/ Export > Import Jobs



2) Click edit on the Import product from live site profile


3) Click Upload button then select product csv file to upload, click Validate File button for system to do initial check on any error on the csv file (the result will show below the Validate File button) then click
button if there is no error.
4) Click run button to execute and check the message box. If there is nothing, then can close the page and check the result on website.

Refer to the attached file for the sample
.