The Merdeka Belajar curriculum is the current curriculum developed by the Indonesian Ministry of Education, which should be implemented thoroughly in 2024. Project-based learning is identically engaged with this curriculum, which offers many advantages to enrich the quality of education. This method has been promoted and implemented in several schools across the region in Indonesia, yet many teachers still need help applying it. This research explores the project-based learning steps for preschool teachers in Bandung through a community service program by Industrial Engineering lecturers in Indonesia. There were 42 participants from 35 kindergarten and playgroup schools who joined the PJBL workshop. With an active learning workshop delivery, a significant result has been achieved that could increase their understanding of the PJBL concept. The "A Healthy House" project was an example of the topic covered in the workshop. To check the participant's knowledge of the PjbL steps, the questionnaire was distributed two times, before and after the workshop ended. Using the Mc Nemart test, the PJBL workshop has significantly impacted the teachers. They could understand the principles of PjBL and the steps of the methods.