Drupal Submenu on left sidebar I have added primary links and enable as expaned . Which is working fine for me 

&gt; About 
&gt;  - test1 
&gt;  - test2 
&gt;  - test3


Now i want when i click on about or nay test1, test2, test3 page 

I want a block on left sidebar containing  sub menu items 

test1 
test2 
test3 


Anybody have an idea how to do this 

I am using Bootstrap 3 sub theme 

Thanks
You can use Menu Block Module. It will display your menu as a block. 

1) Create a new menu block.

2) Select parent menu as a "About".

3) Select its region and page visibility to about page url (and inner pages urls too if you want to display it on inner pages.)

4)Click on save.