Restricting connections via KerioVPN from certain IPs?

Question

Kerio

Good afternoon, there is Kerio control + VPN, at the moment from any IP address (by entering IP, login, password) you can connect to the Kerio server via VPN, I want to limit this by entering only certain IP addresses (remote offices) so that they can enter.
Currently available in the traffic rules:
KerioVPN 4090 port "Source - WAN" "Destination - Firewall" "Service - KerioVPN" "Action - allow and keep records".
I understand correctly that in order to restrict VPN connections from certain IPs, it is necessary to create a "Group of IP addresses" and register IP addresses for which we will enter our network via VPN.
Further, in the traffic rules above KerioVPN, specify: "Source - Group of IP addresses" "Destination - Firewall" "