Thank you for your replies! I think they answer my question at the moment.

My question is not how to create line strokes. My question is how to create predefined line strokes that can be used as templates. For example, I have predefined line strokes for river, border, street, railway, and so on. When I draw a line, I would like to assign one of these predefined strokes to ...

Examples of line symbols:
- Dashed red line with certain width
- Solid green line with certain width

Hello,

in Inkscape, it is possible to create a symbol library. I would like to create a symbol library with line symbols. So, when I draw a line, I can assign one of these line symbols to my line. Is this possible?

Thanks,
Barbara