Running interference studies

How do I import existing contour data from new study that I am working into the interference tab.
It looks like I have re-enter all the site data into interference tab.
It says it needs a contour list.

The contour list seems to disappear after I run propagation study.

I load the data under the "Radio Transmitter". But after I calculate the matrix and go back to radio transmitter after viewing composite map, the file is gone.

When I get to Composite Map, the contour is there, but now it opens as an "Object inspector"