# CVADD Command
[GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [C](Help%20System/GSTARCAD/2022/Commands/C/(C).md)
## Function Description:
This command is used to add control vertices to NURBS surfaces and splines.
## Command Access:
> **Icon:**
> 
> **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: