Use Notepadd ++ for this.
Also set it to UNIX system
Now use the following commandline to add multiple iSCSI targets (one by once)
esxcli iscsi adapter discovery statictarget add -A <vmbhaXX> -a <ip adress>:3260 -n <IQN name of Target>
End the script with rescanning all storage like this
esxcli storage core adapter rescan --all
Now save the file and upload it to the esxi /tmp folder using something like WinSCP
Now from the ESXi CLI make the file executable by doing this
chmod 755 <filename>
now run your script using
./<filename>
Wait for the script to finish
Done!