Extraction in AWR Microwave Office

In AWR Microwave office, we can do extraction by right clicking on the circuit schematics - Add extraction OR we can do extraction by right click - EM Structures - New EM structure - we can select any one of the
available simulators. What is the difference in doing the extraction this way and doing the extraction with
the latter?

Thanks

Hi, Does both types of extraction similar or Is there any difference in the way EM documents are created ?