PCBA (Printed Circuit Board Assembly) box building service is a comprehensive process that involves assembling and integrating multiple printed circuit boards (PCBs) into a single enclosure or housing, by integrating the assembled PCBs into a final product, which includes installing sub-assemblies, fabricating enclosures, and routing wire harnesses etc. Box build assembly is crucial for producing fully functional electronic systems or devices. It ensures that all components are correctly arranged and connected to establish the internal structure of the machine, ensuring its proper functions.