Recursive CTE to get Grandparent, parent, children [duplicate]

I have a data structure that relies on a parent/child model. The top level parent can have multiple children where they can also be parents.

Here's an example of how things can look in the tree:

900107    --> 200237            --> 100112            --> 100113    --> 200238            --> 100114            --> 100115                --> 100120                    --> 100001                    --> 100002--> 200239--> 200501--> 300112--> 400987--> 444444

In this example, 900107, 200237, 200238, 100120 are all parents where 900107 is going to be our grandparent.

Here's how it looks in the table:

ParentPart   Component900107       200237900107       200238900107       200239900107       200501900107       300112900107       400987900107       444444200237       100112200237       100113200238       100114200238       100115100120       100001100120       100002    

I have a recursive CTE that will get me all of the parents and children, but not the "grandkids" or "great grandkids" if they exist.

Here's my CTE:

CREATE TABLE #Hierarchy (ParentPart NVARCHAR(6),Component NVARCHAR(6))INSERT INTO #Hierarchy (ParentPart, Component)VALUES ('900107', '200237'),       ('900107', '200238'),       ('900107', '200239'),       ('900107', '200501'),       ('900107', '300112'),       ('900107', '400987'),       ('900107', '444444'),       ('200237', '100112'),       ('200237', '100113'),       ('200238', '100114'),       ('200238', '100115'),       ('100115', '100120'),       ('100120', '100001'),       ('100120', '100002') ;WITH hier AS (SELECT ParentPart AS MainPart, ParentPart, Component  FROM #HierarchyUNION ALLSELECT hier.MainPart, p.ParentPart, p.Component  FROM hier   JOIN #Hierarchy AS p    ON p.Component = hier.ParentPart)SELECT ParentPart     , Component  FROM hier    ORDER BY ParentPart, ComponentOPTION (MAXRECURSION 0)

This works for the most part....I can get this if I use one ParentPart. We have thousands of ParentParts and we'd need to know who the grandparent is. Ideally we'd want the output to look like this where the parent part is the grandparent and every child and grand child is in the component field

ParentPart    Component900107        200237900107        200238900107        200239900107        200501900107        300112900107        400987900107        444444900107        100120900107        100112900107        100113900107        100114900107        100115900107        100001900107        100002

What would be the best way to do this?