nested datalist

Question

helo sir
pls help me for datalist
nested datalist for single table
i have tourcode,depdate,aridate,depcity,aricity,passenge,cost total
fields in my tourprice table

i would like to display datalist as
depdate aridate
    depcity aricity
      passenger   cost total


using nested datalist.
roght now i  m displaying depdate,depcity
but below table ie paasenger total etc is not working
it display all data in table irrrespective of depcity and aricity

pls help me