Yes, I have my main RB with 3 hotspots configured and wlan1 interface shares all 3 SSID's of those 3 hotspots. So If I am going to use my APs to show those SSIDs, what should I do? and I also want users to login to the network using the portal page, which is already has on my current setup. but configuring capsman and configuring SSIDs in capsman configuration will do the same job? so when a user tries to log in from one of the CAP APs, will the user still get the portal page to login as we have on the original router? Um just confused.
hotspot and and capsman are different things and they do different things - you can have hotspot, but don't have capsman, or have capsman but not use hotspot, or you can use both of them
you should remember one thing - your 3 hotspots work not wifi, they work on particular interface (as you had sad before - on 3 bridges ).
that is why no matter what is connected to this bridges (wireless interfaces of your main router or APs or wired switch) - if it work in one situation, so it will work in others - users will get access to portal page.
i suggest you to try it with one AP and after you will config it and test connect others