How do i split VPN access across two interfaces on a TZ270

We have an office with two parties in it. The firewall should act as a separator for them. So party A should not have access to the Network of party B and vice versa. For that reason i configured a specific interface for each of those two. Both share the same Wan port with the same public ip.
Therefore the VPN will have the same public IP as well.
Is there a way to split to witch interface (X2 or X3) the logged in user will be routed?
Or is there another way like configuring different public IPs to diffrent interfaces?
Category: Entry Level Firewalls
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