T-SQL (SS2K8) :: Combining Result In Column Level

Below is my sample table and data

With Item as(
Select 1 as ItemId,'ItemName1' as ItemName,100 as position union all
Select 2 as ItemId,'ItemName2' as ItemName,200 as position union all
Select 3 as ItemId,'ItemName3' as ItemName,300 as position union all
Select 4 as ItemId,'ItemName4' as ItemName,400 as position union all
Select 5 as ItemId,'ItemName5' as ItemName,500 as position union all
Select 6 as ItemId,'ItemName6' as ItemName,600 as position union all
Select 7 as ItemId,'ItemName7' as ItemName,700 as position),

Mapping as (
Select 1 as Parent, 2 as child union all
Select 1 as Parent, 3 as child union all
Select 1 as Parent, 4 as child union all
Select 5 as Parent, 6 as child union all
Select 5 as Parent, 7 as child )Expected Result:

ParentItemIdParentItemNameParentpositionChildItemIdChildItemNameChildposition
1ItemName11002ItemName2200
1ItemName11003ItemName3300
1ItemName11004ItemName4400
5ItemName55006ItemName6600
5ItemName55007ItemName7700

I was thinking to achieve using union all but if i use union all it will combine the result in rows level. but i need in column level.