You can place custom files on NS to following location
\\localhost\NSCap\bin\Deployment\BDC\bootwiz\oem\DS\winpe\<ARCH>\Base
This folder is getting injected to all boot.wim's bootwiz creates, both PXE + Automation folder.
\\localhost\NSCap\bin\Deployment\BDC\bootwiz\Platforms\WinPE\<ARCH>\Templates
Contains the start-up script that you might want to play around to meet your needs.
NB: all of this is customization, Symantec will not take any responsibility for this :)
NB2: Something interesting I found https://www.asquaredozen.com/2018/07/29/configurin...