I believe images do better than words, so below is an image that explains what I am trying to do
I'll still explain. My openwrt router was installed in order to provide signal in places where there is lower signals, people other than me are going to connect to this router. My openwrt router is configured to connect to the wifi of my main router (which has stock firmware), this was done with a relayd bridge, by following this tutorial https://openwrt.org/docs/guide-user/network/wifi/relay_configuration.
I wanted to install tor on this router, the only problem is that I don't want everyone who connects to this router to be using tor. It has slower speeds, some websites block it, and it could give issues when trying to use your bank account. Because of this I want to create a separate subnet/vlan so I can have an SSID just for tor.
The purpose of showing my old setup, is to show that being on a separate subnet was something my old setup was able to do. Meaning it should be possible on my current setup, unless being wireless or using relayd means it isn't possible (those are the only two differences between my old setup and my current setup)
How can I achieve this? I am using an Archer C1750 v2 (Archer C7 v2) in case you need to know. Is this something I need to configure on my main router, instead of openwrt?