Not automatically, but it takes a few steps with NTLite. For this example, we will roll W10 into the W11 ISO.
1. Extract (7-Zip) both W10 & W11 ISO's to separate folders.
2. Add the W10 ISO's folder.
3. Select the W10 edition you want to export (right-menu ->
Export / WIM), save to file as W11 ISO folder's
sources\install.wim.
When asked to confirm, choose "No" to overwrite (which will append to W11's WIM).
Repeat steps if you're exporting multiple editions.
4. Forget the W10 folder (don't need it). Add the W11 ISO's folder.
5. Load any edition (doesn't matter). Enable
Unattended mode, now click on "Prompt edition selection" in the menu header. There is no need to update Unattended's other settings unless you need to.
6. If your target PC (Dell, HP, or Lenovo) has an OEM license key, we need to create an
EI.cfg if you want to install a different version of Windows than matches the factory license. Like replacing Home with Pro. Skip this step if you don't have OEM keys, or re-installing the same edition.
Open a CMD window as Administrator, and use Notepad to write a new file
sources\EI.cfg in NTLite's mounted Windows folder.
7. Apply your changes. Booting the ISO, Setup will present a list of images to install.