How to configure Tor in Whonix-gateway connect to other VM running proxy?

wwwwhonixorg/wiki/Tunnels/Connecting_to_a_proxy_before_Tor
The link doesn’t tell me how to set the VM.

The proxy software must run either:

under the linux user account tunnel on Whonix-Gateway ™; or
on the host; or
in another virtual machine.

I try to have both NAT and internal adapter on my VM, and set the internal to Whonix network, and forward the traffic from Whonix-gateway to VM’s internal adapter to proxy software by iptables, the proxy is running, but Whonix-gateway is not connection.

Which method?

Which VM?

Doing that for Whonix-Workstation is a very bad idea. Can cause clearnet leaks.

Setting change not mentioned means possibly no such settings change required.

Sorry the link I had posted is not right, now I have update the link.

Sorry the link I had posted is not right, now I have update the link.
Sorry the link I had posted is not right, now I have update the link.

My answer will probably stay the same. I suggest posting a new forum thread to avoid confusing. Then we can delete this one.