Sounds like you want to create a forum channel Discord is a voice, video, and text communication service used by over a hundred million people to hang out and talk with their friends and communities. When you create a new channel, select forum for the channel type and set it up how you like
Threaded Channels – Discord
If you click the “learn more” link mothered an intro page, and at the bottom of that is a link to the help center article for setting it up.
I'd like to see in discord a new feature
When you create a new channel, you have various options which determine how the channel behaves I suggest adding a new channel type, which is specific to and optimized for threads This will make discord even closer to a forum replacement.
