Can you dual-boot EOS with Windows and keep Grub?

I already have Endeavour OS installed and want to dual-boot with windows while keeping my grub.
Is this possible?
Also my machine uses a BIOS just in case.

Of course, this is possible. Did you install EOS after installing Windows? Can’t you see Grub? In this case, you need to install and use the grub-customizer program. Is Windows not included in Grub? Then this is the solution.
Did you install Windows after installing EndeavourOs? In this case, you need to restore Grub to the MBR. For example, using this.

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This small tutorial should help too: