Creo Simulate > References > Sketcher > Creating Sketcher Geometry > To Create a Chamfer Trim
  
To Create a Chamfer Trim
1. Click Sketch and then click the arrow next to Chamfer.
2. Click Chamfer Trim.
3. Select the first line or arc at the approximate point at which you want to place the chamfer.
4. Select the second entity. Make sure to select the point at which you want to place the chamfer. The chamfer is created.