No, it is not a Schedule Cast, it belongs to "Arora" category. They don't belong to Khatri tribe because they are originally from India and does not came from Pakistan/Undivided India.
no bahti belon to o.b.c caste or some case forward caste bhati also called Ghirth means, Ghirth are a Hindu Rajput.They are also known as the Chaudhary
Off course NOT. KOHLI belongs to khatri caste (also called kshatriya in hindi). Khatri caste is one of the highest caste in punjabis. However "KOLI" caste is a SC caste in punjabis.