How do i create TOC in a topic .dita file

I am unable to create Table Of Contents(TOC) in a topic file which i have created using PTC Arbortext Editor with styler. How do i insert the TOC markup or tag in my file.

I have attached the following file for your reference, which contain my dita file & style sheet as well.

1) HOW_TO_USE_THIS_MANUAL.dita

2) SHOP_MANUAL.style.

Regards,

Kiran varma