@Steve_CPA  I am unaware of any way to push the P&L to show up in any way except alphabetically.

This being the case, the only three options I see are to:

A) Rework your account number sequence which may not be an option. Or,

B) Use the Parent accounts' names to force them into the sequence you want. While Children of a particular Parent will always be alphabetized at their particular organization level, Children will still always be forced to show up under their respective Parent in the P&L. Or,

C) Actually incorporate the numbers into the start of the account names themselves.