To add a rotation parameter to a dynamic block definition
Block
panel
Block
EditorAt the Command prompt, enter bedit.
Action
Parameters panel
RotationIn the Block Editor, in
the Block Authoring Palettes window, Parameters tab, click the Rotation
Parameter tool.The angle shown in the Properties palette when you select the block reference in a drawing is measured relative to the base angle specified in the block definition.
Open/Save
panel
Save
BlockAt the Command prompt,
enter bsave.
Toolbar: Standard