begin{tabular}{|c|c|c|c|c|}
hline
 & multicolumn{2}{c|}{Demand} &  multicolumn{1}{|c|}{} &  multicolumn{1}{c|}{}  \  cline{2-3}
 AAA& Group 1 & Group 2 &BBB & CCC \ cline{2-3}
hline
 &   &  & &\
hline
& &  & &\
hline
end{tabular}