I have a subform that will be used to enter data to tblEmployeeTrainStatus. Once select employee clockNo on mainform, user will select training course from combo box in subform. this training course along with trainingID, status code and date should update tblEmployeeTrainStatus. It does not add new training course records to table. I think I don't have a clear understanding of control source vs. row source. Question is how do I program subform to take selected data from subfrm combobox and input to table that subform is based on?