# JOIN Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [J](Help%20System/GSTARCAD/2027/Commands/J/(J).md) ## Function Description: This command is used to create a single object by connecting the endpoints of linear and curved objects. Users can use this command to combine a series of finite linear and open curved objects at their common endpoints to create a single 2D or 3D object. The generated object type is determined by the selected objects, the first selected object and coplanar objects or not. ****Note:**** Xlines, Rays and closed objects can not be joined. ## Command Access: > **Icon:**  > **Menu:** Modify > Join > **Ribbon:** Home > Modify > Join > **Toolbar:** Modify > Join > **Command:** JOIN > **Alias:** J ## Command Prompts: ``` Select source object or a merger of multiple objects ``` ## **Source object** Specifies a single source object to which you can join other objects. Press Enter to select the objects to join. The following are rules: - **Line**:Only lines can be joined to the source line. The lines must be collinear with the source line, but there can be a gap between two lines.   - **Polyline:** Users can join a line and an arc to form a polyline. The selected line and arc must on the same plane in the XY plane of UCS and share a common vertex.  - **Arc:** An arc can be joined to the source arc. All the arcs must have the same radius and center point, but there can be a gap between two arcs. It joins the selected arc along counterclockwise direction to the source arc. Select the Close option to convert the source arc into a circle.   - **Elliptical arc:** An elliptical arc can only be joined to the source elliptical arc. The elliptical arcs must be coplanar and have the same major and minor axes, but there an be a gap between two elliptical arcs. Select the Close option to convert the source elliptical arc into an ellipse.   - **Spline:** The source spline should share the common vertex with the selected object. They can be on different planes. The resulting object is a single spline.  - **Helix:** The helix objects can join together to form a single spline. The selected two objects should share one common vertex. --- **Related References：** - [Commands about Editing Specific Objects (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Editing%20Specific%20Objects.md) **Related Concepts：** - [About Breaking and Joining Objects (GstarCAD 2026)](../../../2026/Commands/02%20Concepts/About%20Breaking%20and%20Joining%20Objects.md) **Related Tasks：** - [To Break or Join Objects (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Break%20or%20Join%20Objects.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_J/JOIN.html) · © Gstarsoft Co., Ltd.