In the case of Cisco, ACLs are set for each port, but in the case of WatchGuard's FW (model: XTM-2 series) or your company's products in general, ACLs are set for the entire FW. Will it be done?
Fireware policies (ACLs) can be applied to a single firewall interface or to multiple ones or to single IP addrs or to subnets or authenticated users or ......
Fireware is nothing like Cisco.
For the record, what firewall model do you have??
Control Network Traffichttps://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/_intro/control_network_traffic.htm
I can't see this URL.