This study aimed to design and implement a capacity-building program for Senior High School (SHS) Accountancy, Business, and Management (ABM) teachers to address specific teaching challenges. Using a qualitative action research approach, the research has identified key gaps within the ABM strand. Through this approach, the particular needs of SHS ABM teachers were analyzed alongside the challenges they face and the effectiveness of current support programs. Six SHS ABM teachers and one Subject Group Head (SGH) from Casiguran Technical Vocational School were selected through purposive sampling. Data gathering was conducted using an interview guide, implementation evaluation, and reflective sheets to gain an understanding of the teachers’ capabilities, challenges, and instructional practices. Insights from the gathered data were used to develop a tailored intervention program. The program was composed of a series of workshops on innovative teaching strategies, enhancement of digital skills, and the creation of effective assessments. Also, mentoring and ongoing support were included in the program to help promote an entrepreneurial mindset among students. Phases were implemented in the capacity training program, and the results were evaluated through participants’ feedback, teacher performance, and improvements in student learning outcomes. Concrete solutions were provided to improve ABM teaching, resulting in increased learners’ engagement, rich learning experiences, and improved academic performance. The results have generated recommendations for the institutional policies and initiatives to improve capacity training and support the continuous professional growth of ABM teachers. In conclusion, the research has provided educators with the core skills and resources to meet the demands of 21st-century education and foster an effective learning environment for the students.