Root Level
[expandsub1 title="Nested Level 1"]
[expandsub2 title="Nested Level 2"]
[expandsub3 title="Nested Level 3"]
[expandsub4 title="Nested Level 4"]
[expandsub5 title="Nested Level 5"]
[expandsub6 title="Nested Level 6"]
[expandsub7 title="Nested Level 7"]
[/expandsub7]
[/expandsub6]
[/expandsub5]
[/expandsub4]
[/expandsub3]
[/expandsub2]
[/expandsub1]