Different software may require widely different methods/workflows.
To create offset paths:
- add a new transparent layer
- stroke the path in line mode with widh=2x the offset (so 10, in your case)
- Layer>Transparency>Alpha to selection
- Select>To path
- Delete the transversal segments on the ends
- Delete or hide the layer
To create offset paths:
- add a new transparent layer
- stroke the path in line mode with widh=2x the offset (so 10, in your case)
- Layer>Transparency>Alpha to selection
- Select>To path
- Delete the transversal segments on the ends
- Delete or hide the layer