A headscratching question 
Really.
From one side, the rules donāt allow to have the same item in more than one pack.
From other side, the rules allow to combine in pack the sfx which are already uploaded separately.
So from formal side, the difficulty is about can your āreduced packsā be concidered as āsingleā items including some variations or as āpacksā itselves. Sometimes itās obvious from itemās price, but sometimes itās not.
It could be clearer if such small āpacksā containing only fresh (not uploaded earlier) items were strictly concidered as āsingle itemsā, and be allowed to be then recombined in another bigger packs. So we could have the same item twice in portfolio (maximally) if included in pack. Butā¦ from one more side, it would legally let the authors to play with endless repackages without much adding of new items, which is an absurd.
Such mess is because the sound packs can be as of approved already, as also of fresh items - the item containing a few stylistically similar sfx, is also named āpackā. But the same time sound packs follow the general packs rules and are not clarified specifically.
What an intrigue! 
Sorry, I cannot shed any more light at this, can only suggest to upload that sfx separately at first (as single items) and then combine it to big pack. To avoid possible problems with that mess.
Maybe someone else is more informed about this to clarify please?