@Saptharishi Suresh20 Once a post is published, you cannot move it to a group or from a group to another.
However, there is a way to ban users from posting in the general feed and make it mandatory to pick a group when posting content. To make it mandatory, you need to go to Admin Panel> under the App Settings from the left-side menu click on Groups> scroll down and turn off the toggle that says "allow users to post to home feed"> Save changes.
