SELECT 1, LEVEL, item_Name,'',to_char(item_no) FROM ITEM2 CONNECT BY PRIOR item_no = CATAGORY_NO START WITH item_no in (1,2,3,4,5,6,7,8,9,10)

PROCEDURE p_populate_menu IS
tree4         ITEM;
my_tree       Number;	
BEGIN
       tree4 := Find_Item('block2.tree4');
       my_tree  := POPULATE_GROUP('tree_rg');
       Ftree.Set_Tree_Property(tree4, Ftree.RECORD_GROUP, 'TREE_RG');
END;

begin
	p_populate_menu;
	end;

SELECT 1, LEVEL, item_Name||'('||to_char(item_no)||')','',to_char(item_no) 
FROM ITEM2 
CONNECT BY PRIOR item_no = CATAGORY_NO 
START WITH item_no in (1,2,3,4,5,6,7,8,9,10)

01 
 1001
 1002
 1003
an as on 

SELECT 1, LEVEL, item_Name||'    ('||to_char(item_no)||')    ','',to_char(item_no) 
FROM ITEM2 
CONNECT BY PRIOR item_no = CATAGORY_NO 
START WITH item_no in (1,2,3,4,5,6,7,8,9,10)
ORDER BY ITEM_NO

GENERAL ITEM (1)
SPARE PARTS (2)
NEEDLE (3)
  CLIPPER (1001)
  TAG PIN (1002)
  FOLDER (2001)
  MIX SPARE (2002)
  DB*1 # 18 (3001)
  DB*1 # 19 (3002)

GENERAL ITEM (1)
  CLIPPER (1001)
  TAG PIN (1002)
SPARE PARTS (2)
  FOLDER (2001)
  MIX SPARE (2002)
NEEDLE (3)
  DB*1 # 18 (3001)
  DB*1 # 19 (3002)
    

Create popup menu and add it in property of hierarchical tree.
write code on the menu items.