Issues making windows 10 bootable drive

I'm trying to use this guide to create a windows drive with the same functions as bootcamp
https://dortania.github.io/OpenCore-Post-Install/multiboot/bootcamp.html

However I'm getting an issue when I try booting from it
When booting up windows and going through the set up steps then select which drive to use, it says there's not enough space on the drive or that it's not the right format (the drive seems split into two parts?)
I'm not tech savvy at all so it's possible I messed up a step, any guidance would be helpful!

If it helps this is the drive

https://preview.redd.it/iscu5arwv4pf1.png?width=1122&format=png&auto=webp&s=f1128ab737eb8be6d95d25c0105d3f75468c0ec0

https://preview.redd.it/1c5vd9rwv4pf1.png?width=1704&format=png&auto=webp&s=a86996277f526ac70e71e63997c2670a848fef8d