portion off
Advanced (C1)neutral
To take a part of something and set it aside or give it to a specific purpose.
"The council portioned off part of the budget for road repairs."
Hear it in context

Inside America’s Best Michelin Star Restaurants | Bon Appétit
Bon Appétit · 160:33
Tail portion off here.

Live Recon and Google Dorking on the Department of Defenses Vuln Disclosure Program with @thedawgyg
NahamSec · 68:39
We're going to cut this portion off.