dwg to vss conversion is often used by users that want to use vectors from AutoCAD drawings as shapes for Microsoft Visio drawings. This should be doable with Visio itself actually as it supports DXF/DWG format, but perhaps only of certain version and content.
In any case, you can find many guides and tutorials about using vectors and simple CAD drawings in Visio, some even on YouTube.
Updated: October 25, 2023