How to remove column output in a for xml path query with a group by expression?

I forgot how to remove a column from being output in a FOR XML PATH query using a group by expression. I used it before but somehow I lost the article. In the below example. I do not wish to have idForSomething output in my result by I want to use it as condition for my inner query.

SELECT
   idForSomething, 
   SUM(allSomething) AS [@sum],
   (SELECT  
       innerSomething AS [@inner], innerSomething2 AS [@inner2]
    FROM    
       someTable s2
    WHERE   
       s2.innerSomething = s1.idForSomething
    FOR XML PATH('innerlist'), TYPE)
FROM    
    someTable s1
WHERE   
    idForSomething = 1
GROUP BY 
    idForSomething
FOR XML PATH('listofsomethings')

Added XML Body:

    <listofsomethings @sum="10">
        <innerlist @inner="..." @inner2="..." />
        <innerlist @inner="..." @inner2="..." />
        <innerlist @inner="..." @inner2="..." />
    </listofsomethings>

I will look around again online, but I asking for the syntax to SQL Server to NOT USE "idForSomething" column in the final output. I thought it was something like NOOUTPUT but I can't remember and it does not work.