Category talk:Stub categories needing attention

Trying to sort according to type of attention
Hi - I don't know how to make a sub-category land under a letter representing one of the conditions noted in the category header (N, O, P, Q, S, U) rather than appearing under its name in the general category. For example,  shows up under "C" instead of "O" (for Oversized). Can someone tell me the code for changing the order? Her Pegship (?) 00:17, 27 September 2021 (UTC)