Implement Bootstrap Side Menu bar in ASP.Net MVC

HI,

I have one menu bar in mvc in that i have 1 dropdown fiction after clicking of fiction it was dispalying invoice template, finctionbook2 and 3

1)my requirement is that after clicking of invoice template again i need sub dropdowns invoice template1 and invoice template2

2)it was not displaying dropdwons bydefault i need to dipslay dropdowns by default

Could you kindly please help me