Sheetmetal > Designing in Sheetmetal Design > Creating and Modifying Walls > Modifying Walls > Extending Walls > About the Extend Tool in Sheetmetal Design
  
About the Extend Tool in Sheetmetal Design
You can use the Extend tool to lengthen an existing flat wall with a straight edge either normal to the selected edge or along the boundary edge. Walls are typically extended at corners.