# DGNATTACH Command [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).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/2027/Commands/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:/**  --- **Related References：** - [Commands about Underlays (GstarCAD 2026)](../../2026/Commands/00%20Command%20Groups/Commands%20about%20Underlays.md) **Related Tasks：** - [To Display a List of the Underlays Attached to a Drawing (GstarCAD 2026)](../../2026/Commands/01%20Procedures/To%20Display%20a%20List%20of%20the%20Underlays%20Attached%20to%20a%20Drawing.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/DGNATTACH.html) · © Gstarsoft Co., Ltd.