To add an alignment parameter to a dynamic block definition
Block
panel
Block
EditorAt the Command prompt, enter bedit.
Action
Parameter panel
AlignmentIn the Block Editor, in
the Block Authoring Palettes window, Parameters tab, click the Alignment
Parameter tool.This base point is the default location for the alignment parameter grip.
Open/Save
panel
Save
BlockAt the Command prompt,
enter bsave.
Toolbar: Standard