The ability to create multireddits is a relatively new feature added to Reddit that allows users to lump reddits together based on their own preferences. You can choose setting of your own will like Public or private. This way You can improve your content Syndication’s on Reddit.
1) Click on the sidebar to show the multireddit menu.
2) Press the “create” button.
3) Type in a name for the new multireddit. Remember that names cannot have spaces!
4) Type in all of the subreddits that you want to merge into the multireddit.
5) Add a short description if needed.