Exporting XML for 2 sheets in same design

Does anyone knows how can we export xml for 2 sheets in 1single design.

I used the selection option to export the xml but both sheets details are not getting captured in xml, wherever when I created the from to table for both the sheet by selected items option the report table generated had all the info.

I tried to create report xml with the help of from to table generated but only fiber(wires)info is coming into the xml.

Need help...