Sorting From Previous row RefNo wise

VouNo       Ref       InvDate       TCAmount
---------------------------------------------------------   
Inv/27582DO/1047 2014-03-12190                 
DO/1047WO/12792014-03-12100
DO/1046WO/12782014-03-1260
DO/1045WO/12782014-03-1230
WO/1279QTN/1529        2014-03-12 100
WO/1278QTN/1529    2014-03-1260
QTN/1529QTN/1529   2014-03-12100

I Want like below


VouNo       Ref        InvDateTCAmount
------------------------------------------------------------  
Inv/27582DO/1047 2014-03-12190                 
  DO/1047WO/12792014-03-12100
   WO/1279QTN/15292014-03-12100
     QTN/1529QTN/15292014-03-12100
  DO/1046WO/12782014-03-1260
    WO/1278QTN/15292014-03-1260
     QTN/1529QTN/1529 2014-03-12100
  DO/1045WO/12782014-03-1230
    WO/1278QTN/15292014-03-1260