Buffer

It allows to create a Buffer around an object of any kind, being the result a polygon.

Select the Buffer tool from the drawing tools.

1. Offset and Units of measurement:  enter the distance between the original object and the new one.
2. Target layer:  layer where the new objects will be created.  You can choose an existing layer, or create a new layer.
3. Overlap polygons: the wizard will save the object in the target layer, without modifying the reference object.
   
4. Eliminate previous: the wizard will delete the reference object.
   
5. Subtract previous: the wizard will subtract from the new object the selected reference polygon.