How do I dual boot windows 11, arch linux, and windows 7?

[Windows 7]

I already dual boot windows 11 and arch with grub. How do I partition for windows 7, and add it to the grub boot menu in linux? For now I usually boot up linux and use grub to either choose linux or windows 11. I'm using a ASUS Vivobook btw and I have the things ready to install windows 7(Product key, etc.).

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