A group is a mini-community with its own membership consisting of up to one blog, media gallery, and forum. All of a group’s content is accessible by members of the group.
You must create a group category before you create a group.
Procedure
1. Navigate to Control Panel Dashboard > System Administration > Group Administration > Groups and Categories > New Groups. The Group Options page display.

2. Specify the group properties.
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Name – Group name.
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URL – Group URL.
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Description – Describes the group.
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Group Type – Specifies whether the group is public or private.
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Group Category – Specifies the category to which the group is assigned.
3. Click Save.
After you save the group, Community Server provides additional tabs on which you can specify additional properties for the group. Click here for explanations of the group properties.