Unfortunately, it is not possible to create property mapper mappings that take two custom properties as input.
However, you do not need to use property mapper at all for this use case.
Instead, use "Tools" -> "Select Element" to select all edges where property 1 is true. Then run "Select Elements" once more with "Act On Current Selection Only" enabled and select all edges where property 2 is true.
After that simply adjust line color and line type for the selected edges through yEd's properties view.