My ability of English is not good, now I have a problem is I want to make a menu collapse jQuery or coolapse bootstrap that have a multiple rank or multiple level (>2 or >3 level) sush as a picture below but I don't know how to do it, so I need a guide, link direction, or instruction to make a reference, thank all very much :
http://i1055.photobucket.com/albums/s505/vn_photo/how_zpsebdfc0f2.png
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