# DGNATTACH Command [GstarCAD 2022](Help%20System/GSTARCAD/2022/Index.md) → [Commands](Help%20System/GSTARCAD/2022/Commands/(Commands).md) → [D](Help%20System/GSTARCAD/2022/Commands/D/(D).md) ## Function Description: This command is used to insert a DGN file as an underlay into the current drawing. The Select Reference File dialog box is displayed. Once you select a DGN file, the [Attach DGN Underlay dialog box](Help%20System/GSTARCAD/2022/Commands/03%20Dialog%20Boxes/Attach%20DGN%20Underlay%20Dialog%20Box.md) is displayed. ## Command Access: > **Icon:** >  > **Menu:** Insert \> DGN Underlay > **Ribbon:** Insert \> Reference \> DGN Underlay > **Toolbar:** Insert \> Insert a DGN Underlay > **Command:** DGNATTACH > **Alias:** / **Command Prompts:/**