the simplest way to create a usb bootable stick for uefi-based systems is the following. this is useful when install.wim is larger than 4gb. you just need a usb stick (8gb or more, depending on the size of install.wim) and the iso file of your preferred windows os (10, 11, or matching windows server):

1. make two partitions: the first parition is 1gb in size, formatted with fat32; the second partition is the rest of the stick, formatted with ntfs;
2. first partition (fat32): use 7zip to extract the contents of iso into the first parition, except the 'sources' folder;
3. first partition (fat32): create the 'sources' folder and use 7zip to extract 'sources/boot.wim' only from iso file into the folder;
4. second partition (ntfs): use 7zip to extract all contents of iso into the second parition.

that's it.

actually you can have more than two paritions. (additional partitions are used to store drivers and base apps) just make sure the first two are set up accordingly.