Boot

add boot entry
https://linuxconfig.org/booting-a-ms-windows-os-using-grub
Boot to your Linux
Open a Terminal window
Type: 
sudo os-prober
If the results identify a Windows 10 install, type sudo 
update-grub which will update the GRUB entries and add it
Reboot your computer and test to see if Windows 10 is a new option to select.
remove boot entries
If you can boot into Linux in UEFI mode, use 
efibootmgr:
efibootmgr or 
efibootmgr -v to list entries;
efibootmgr -b XXXX -B to delete an entry by number.
If you can boot into Windows in UEFI mode, use 
bcdedit:
bcdedit /enum firmware to list entries;
bcdedit /delete {GUID} to delete an entry by its "identifier".