How do i change Display Grouping 2 level to 3 level

[villamarket]

dear friends,

Please advice how do i change display from level2 to level3 grouping ?  i know we can add level3 by adding at the backend but how to display level3 grouping  as picture2.

I use CE2.2

thank for help.

picture1 (2 level)

Picture2 (3 Level with Partition display)