Hello buddy you can do MBA in many field after completing B.TECH these field are as

MBA in General management

MBA in Global management

MBA in Health Care

MBA in Hospitality and Tourism

MBA in Human Resources

MBA in Industrial management

MBA in Consumer Behavior

MBA in Criminal Justice

MBA in e-Business

MBA in Education

MBA in Engineering

MBA in Entrepreneurship

MBA in Information Technology

MBA in International Trade and Business

MBA in Knowledge management

MBA in Leadership

MBA in Marketing

MBA in Media

MBA in Nonprofit and Government

MBA in Operations and Logistics

MBA in Organizational

MBA in Risk Management

MBA in Sport management

MBA in Systems