Routing Rules/Path of not directly connected internal Subnet

[canterro]

We have Issues Adding Rules for 3 Subnets that are VLANs and are defined on our Switch, and the Gateway is also on the Switch.
How do we add NAT and Firewall Rules for these Subnets?
We added a own Gateway for these at System: Gateways: Single
Name    Interface    Protocol    Priority    Gateway
Switch_VLANs    LACPVM    IPv4    255    192.168.250.254

At System: Routes: Configuration we configured
   192.168.105.0/24   Switch_VLANs - 192.168.250.254
   192.168.110.0/24   Switch_VLANs - 192.168.250.254

The Subnet's are Pingable and connected but
What I can't find is a way to define Firewal Rules and NAT

- Bernhard