# BACTIONSET Command [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [Commands](Help%20System/GSTARCAD/2021/Commands/(Commands).md) → [B](Help%20System/GSTARCAD/2021/Commands/B/(B).md) The BACTIONSET command is used to specify action selection set associated with an action in a dynamic block definition. **Command Access:** > **Command:** BACTIONSET **Command Prompts:** > Select action object: > Specify selection set for action object \[New/Modify\] \<New\>: **Function Description:** This command could be only used in “Block Editor”. Users could redefine associated object selection set by creating a new one or adding or removing objects from existing selection set. **Note:** when the BACTIONBARMODE system variable specified to 1, the BACTIONSET command is forbidden. **Relative Glossary:****Specify selection set:** Specify selection set for creating a new one or modifying it. **Select object:** Specify object to be contained in action. **Remove:** Specify object to be removed from selection set, this object is associated with action. **Specify first corner of stretch frame:** Specify a frame for stretch boundary. **CPolygon:** Specify a cross polygon frame for stretch boundary. **Specify objects to rotate only:** Specify objects to rotate rather than stretch. ## Other versions with matching text [GstarCAD 2016](../../../2016/Commands/B/BACTIONSET%20Command--505d608ac8a0.md) · [GstarCAD 2017](../../../2017/Commands/B/BACTIONSET%20Command--505d608ac8a0.md) · [GstarCAD 2018](../../../2018/Commands/B/BACTIONSET%20Command--505d608ac8a0.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/Commands/B/BACTIONSET%20Command--505d608ac8a0.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/Commands/B/BACTIONSET%20Command--505d608ac8a0.md)