AutoCAD Tips
How to TRIM everything Inside/Outside a Boundary in AutoCAD?
Trim everything inside or outside a boundary in AutoCAD in one operation with the hidden Express Tools EXTRIM command, not available in AutoCAD LT.
AutoCAD Tips
How to Fillet without Trimming the Original Objects in AutoCAD
Fillet a corner in AutoCAD without trimming the original objects by setting Trim mode to No trim, a trick that also works with Chamfer.
AutoCAD Tips