Case statement

Can someone please help with this case statement?

Case substr(cc.prname,1,5)
when 'Expense' then
case substr(p.name,1,5)
when 'Admin' then SUM(DECODE(ts.prstatus,4,(NVL (te.practsum,0)/3600),0)) admin_posted_hours,
when 'Maint' then SUM(DECODE(ts.prstatus,4,(NVL(te.practsum,0)/3600),0)) maint_posted_hours
else SUM(DECODE(ts.prstatus,4,(NVL(te.practsum,0)/3600),0)) proj_expense_posted_hours
end
when 'Capital' then SUM(DECODE(ts.prstatus,4,(NVL(te.practsum,0)/3600),0)) capital_posted_hours
when 'Margin' then SUM(DECODE(ts.prstatus,4,(NVL(te.practsum,0)/3600),0)) margin_posted_hours
else
SUM(DECODE(ts.prstatus,4,(NVL(te.practsum,0)/3600),0)) actual_posted_hours
end