When you right-click on an asset in the project, you will see a list of the assets you can add as children, as has been described previously. If there are export options for the asset you have selected, you will also see these at the bottom of the menu.
The exports which are available depend on the asset that you have selected, but all groups can export a summary of the items in the group. More advanced elements will provide more advanced exports. For example, if you have the channel design module enabled the channel design item can export a full summary of how the channel dimensions have been calculated.