Knowing more about actions in dynamic block editor
Actions define how the geometry of a dynamic block reference will move or change when the custom properties of the block reference are manipulated in a drawing.
Move: Move action causes objects to move a specified distance and angle such as a point, a linear, a polar, an XY parameter, etc, moves all objects in a selection set in a/any direction.
Scale: Scale action such as a linear, a polar, an XY parameter, and so on, scales the selected objects in the direction of the parameter. Users can manipulate the grips in a different ways by changing the properties and values in the Properties palette.
Stretch: Stretch action causes objects to move and stretch a specified distance in a specified location. A stretch action associated with a point, a linear, a polar, an XY parameter, etc.
Polar Stretch: Polar stretch action rotates, moves, and stretches objects a specified angle and distance when the key point on the associated polar parameter is changed through a grip or the Properties palette. A polar stretch action can only be applied to a polar parameter.
Rotate: Rotate action is always associated with a rotate parameter. Selected objects can be rotated freely, or the way the grips are manipulated is different in the Properties palette.
Flip: Flip action is always associated with a flip parameter.
Array: Array action is associated with a linear, a polar, an XY parameter, etc, copies and arrays selected objects in a different ways.
Lookup: Lookup action can only be associated with a lookup parameter.