# BACTION Command
[GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [B](Help%20System/GSTARCAD/2022/Commands/B/(B).md)
## Function Description:
This command is used to add actions to dynamic block definitions. This command
is available only in the Block Editor. Actions define how the geometry of a
dynamic block reference moves or changes when the custom properties of a block
reference are manipulated in a drawing. You associate actions with parameters.
## Command Access:
> **Icon:**
> 
> **Menu:** /
> **Ribbon:** Block Editor \> Action \> Action
> **Toolbar:** /
> **Command:** BACTION
> **Alias: /**
## Command Prompts:
Select parameter: