I have a form with a ComboBox_1 to choose a “System”, (three ComoBoxes) ComboBox_2, ComboBox_3 & ComboBox_4 to choose a practice from the System selected shown in ComoBox_1.
When the form is first opened all 4 ComboBoxes are Null – once you choose the System boxes 2, 3 & 4 will show the...