The flip parameter in Autocad dynamic blocks essentially uses the mirror command to action it. Once again you need to use both an action and a parameter to create the flip or “mirror” command on the drawing that you want to flip. This is typically done for a door when you want to either have it swing to the inside or outside of a room.
First, select the flip parameter and specify the line you would like to flip the elements around. Then you select the flip action and select the elements that you would like to flip.