You have two types of groups in ServiceDesk Plus say, Static group and Dynamic. Add to group option in component list view page is to group bulk of components. These components will be grouped under the Static group by default.
To add components to group,
Click any of the Components link under the Assets block on the left hand side of the page. This opens the components list view page.
Select the components to be added to the group by enabling the check box. This opens the Add Resource(s) to page.
By default you can group components only to the static group. Either to the Existing static group or New static group can be added.
If you would like to group the components under existing static group then click the corresponding radio button. Select the group name from the combo box.
Else, if you would like to add a new static group and group the components, click New Group radio button. Specify the Group Name and relevant information about the group in the Description field.
Click Save button to save the changes.