My google Fu shows me this. https://www.youtube.com/watch?v=QK-CbuxlQho
And this seems handy and relevant.
https://null-byte.wonderhowto.com/how-to/install-kali-live-usb-drive-with-persistence-optional-0162253/

On Tue, Jan 24, 2023 at 9:11 PM Michael via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:

> okay; what I want to do is to create a live pen drive on a 64 gb drive
> with 32GB dedicated to the root partition and the rest going to /home .
> I want to put kali on it (my new toy) and I want to leave room to install
> additional packages. I already tried to install another program on it but
> ran out of room. Kali on the pen drive is something like 20 GB
> I googled 'pen drive dedicated root'' If someone could just let me know
> what search terms to use I can take it from there.
> --
> :-)~MIKE~(-:
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen