# Linear [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [What's new](Help%20System/GSTARCAD/2027/What's%20new/(What's%20new).md) ## Function Description: Creates a horizontal or vertical constraint parameter based on the locations of the extension line origins and the location of the dimension line. ## Command Access: Icon:  Menu Item: / Ribbon: Block Editor > Dimensional > Linear Toolbar: / Command Line: BCPARAMETER > Linear Command Alias: / ## Command Prompts: ``` Specify first constraint point or [Object(O)]: ``` ``` Specify second constraint point: ``` ## Operation Steps: 1、As shown in the figure, select the endpoints of the horizontal and vertical lines respectively to add a linear constraint parameter. 2、The horizontal or vertical distance between the endpoints of the objects will be constrained.  --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/GstarCAD2027NEW/GCR_BCPARAMETER_L.html) · © Gstarsoft Co., Ltd.