We can't do your English work entirely for you.
Granted, I did RMF and have no read Catcher in rye-but know vaguely about it to know it would suit belonging well.
My suggestion is that you should look to find it relating to at least a few poems (granted I don't think they would ever prescribe poems outside Module B). Look for a similar aspect of belonging that is explored in both texts. The views in the two texts may contrast and this can provide a rich depth of discussion.
Not reading the novel or the poems but examples of things you can draw together that may be relevant:
*Use of enjambement in poetry to explore the persona's stream of consciousness/focus on Holden's thoughts in the novel with introspective narrative voice. This could help assert perceptions on belonging or lack of belonging.
*Look at the concept of self identity in both (cultural identity in Immigrant I assume/Holden's adolescent identity)