Hi Kourosh,
The Pivot command only supports one row and one column.
One work around is to use a Text expression column to combine two or more column entries in the data table. The use the Text expression column as input to the Pivot. If you have a large data set (<100,000 rows) the text expression might start to slow down. If you can use this approach and have a lot of rows, let us know if it seems slow.
Would this help for your case?