This will add Local ISO Storage to the server That youi can then map and copy iso files over to.
mkdir /var/opt/ISO_IMAGES
xe sr-create name-label=ISO_IMAGES_LOCAL type=iso device-config:location=/var/opt/ISO_IMAGES device-config:legacy_mode=true content-type=iso
Then to mount a Windows Server use:
mkdir /mnt/tmp
mount -t cifs //192.168.1.10/ISO /mnt/tmp -o username=administrator
use the following to copy files over
cp -a /mnt/tmp/*.iso /var/opt/ISO_IMAGES