Convert STL to PRT

First and foremost it is incredibly difficult to give precise answer about how to convert stl to prt, simply because there are dozens of different PRT formats. Siemens NX, PTC Creo, CADKEY, Keycreator and probably many others use .prt files to store the default CAD/3D part data. So you should use the information here and adjust it for the particular software format you require.

STL on the other hand is a widely used file format in 3D printing and computer-aided design and as such supported in pretty much every CAD / 3D model software either directly, or via special plugin.

This means that stl to prt conversion is typically searched by users that want to import STL content as basis for making new parts, or just a direct file conversion.

How to convert STL to PRT

You can import the meshes or geometry of any STL format and reuse it for making new part. This is typically done with either open or import function, but requires modest knowledge about the process and have idea about whether this should be import of just model (meshes) or solid / surface data.

Once the data are properly imported, you can finish the work on your part and save it in PRT format.

A viable alternative is to use one of the dedicated 3D modeling / CAD tools (like Datalink CrossManager) that support direct way to translate STL 3D models to PRT format, just make sure to select the specific PRT file type need.