From the availability grid find the dates and units you want to reserve. Next hold down the "Shift" key on your keyboard and drag to select multiple units for the desired number of nights.

Remove or select specific units as needed by clicking in the box that shows the currently selected units.

Click "Contact Info" and choose between linking these units to an existing group or creating a new one.

For a new group: Input Group Name and Group Leader information.

For an existing group: Select from the Group List.