The neutral must accompany each circuit. It's because separating them results in stray magnetic fields that can heat conductive materials in the vicinity. Besides that, the codes offer no formula for calculating the size of common neutrals that serve several branch circuits.
source https://www.inspectorsjournal.com/topic/18873-main-panel-hot-wires-using-neutral-busbar-at-a-different-panel/?do=findComment&comment=172566
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