# CVADD Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [C](Help%20System/GSTARCAD/2027/Commands/C/(C).md) ## Function Description: This command is used to add control vertices to NURBS surfaces and splines. ## Command Access: > **Icon:** ![](Help%20System/GSTARCAD/2027/assets/42a2968a579b2b1c7c19950ea0d8ca291e999f4e60480ecc0729f551624ac8b5.png) > **Menu:** Modify > Surface Editing > NURBS Editing > Add CV > **Ribbon:** Surface > CV > Add > **Toolbar:** / > **Command:** CVADD > **Alias:** / ## Command Prompts: ``` Select a NURBS surface or curve to add control vertices: ``` --- **Related References：** - [Commands about Constructing 3D Solids and Surfaces from 2D Geometry (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Constructing%203D%20Solids%20and%20Surfaces%20from%202D%20Geometry.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_C/CVADD.html) · © Gstarsoft Co., Ltd.