vlan on multiple interfaces without IP

[vanawful]

I have an environment in which industrial switches (not fortiswitch) needs to be on the same mgmt vlan for all subnets. I am not finding a way to have the mgmt vlan passthrough on a foritgate with v7.6.x while also having the interfaces for the OT subnets.

Confused? Here is an example:

- Port WAN1: vlan 200 interface (main OT network), tag vlan1000 (mgmt) without creating interface

- Port 1: Contains vlan 801 interface

- Port 2: Contains vlan 802 interface

- Port 3: Contains vlan 803 interface

VLAN1000 must be tagged on Ports WAN1, 1, 2, and 3, without interface (passthrough). This is used to manage the managed switches.

This can be done on industrial firewalls from Siemens and Hirschmann. How is it done with Fortigate?