My main website in on React. Now I want to include a 3 sub domains and want those sub domain on Angular. So my questions is can i do the sub domain as a website on different technology?
yes you can have different domains or even one domain with different routes with react, angular, etc. To make this life you need to set up redirect logic on your load balancer or server where you are hosting to resolve where traffic must go, also u need to remember that navigation between 2 microservices (for example angular and react) will be with full reload (without SPA).