# BPARAMETER Command
[GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md)
**Function Description:**
This command is used to add a parameter with grips to a dynamic block definition. The BPARAMETER command can only be used in Block Editor. The parameter is used to define custom property for block reference. The added parameter must be associated with a certain action to form a dynamic block.
**Command Access:**
> **Icon:** 
> **Menu:** /
> **Ribbon:** Block Editor > Parameters > Parameters
> **Toolbar:** BE: Manage > Parameter
> **Command:** BPARAMETER
> **Alias:** /
**Command Prompts:**
```
Enter parameter type [Alignment/Base/pOint/Linear/Polar/Xy/Rotation/Flip/Visibility/looKup]:
```
## **Alignment**
Rotates block reference around a certain point to align it with other objects.
## **Base**
Specifies a changeable base point for geometry graph in dynamic block reference.
## **pOint**
Defines custom x and y properties of block reference.
## **Linear**
Specifies the distance between two key points in block definition.
## **Polar**
Specifies distance and angle between two key points in block definition.
## **Xy**
Defines the x and y distance from base point in block definition.
## **Rotation**
Defines rotation angle of block reference.
## **Flip**
Mirrors the selected object or the whole block reference by the reflection line.
## **Visibility**
Defines the visible object or invisible object in block definition.
## **looKup**
Defines custom parameter that determined by lookup table.
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**Related References：**
- [Commands about Dynamic Blocks (GstarCAD 2026)](../../2026/Commands/Commands%20about%20Dynamic%20Blocks.md)
**Related Concepts：**
- [About Adding Parameters to Dynamic Blocks (GstarCAD 2026)](../../2026/Commands/About%20Adding%20Parameters%20to%20Dynamic%20Blocks.md)
**Related Tasks：**
- [To Specify Settings for Parameters and Actions (GstarCAD 2026)](../../2026/Commands/To%20Specify%20Settings%20for%20Parameters%20and%20Actions.md)
- [To Specify the Text Color for Actions (GstarCAD 2026)](../../2026/Commands/To%20Specify%20the%20Text%20Color%20for%20Actions.md)
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[Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/BPARAMETER.html) · © Gstarsoft Co., Ltd.