I don't understand what you mean by this:
I need to maintain columns Ename,Project are in drop down list.
But you can accomplish the first part by creating a "Hierarchy" in Tableau which includes the fields Type,Category,Ename,status,HrsSpent. Then a user can click the + symbol next to the first field in the hierarchy and begin opening up and closing columns, You can read more about hierarchies in "Help".
Thanks for your replay.
Ename and project columns I want be in drop down list just like as quick filter,When I select the Ename column,In report I want be displayed related columns only.