You can definitely import 3D models saved in ISO STEP product data files (.stp, .step) to CATIA software and use it for making new parts (.catpart). If you do not have access to CATIA, you have to rely on some 3rd party alternatives or dedicated conversion solutions.
Home > Search converters: step to catpart
Conversion of step file format to catpart file format beta
Search for step to catpart converter or software able to handle these file types.
Convert ISO-10303 STEP product data file to CATIA part data.
We have found 3 software records in our database eligible for .step to .catpart file format conversion.
Microsoft Windows software 
- convert step to catpart on Windows
CATIA
A PLM/CAD/CAM/CAE software suite
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from step file | No | Yes | Yes | step editor | Yes | No | Yes | No |
to catpart file | No | Yes | Yes | catpart editor | Yes | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned step to catpart. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
EnSuite
A CAD visualizaton, analyzation and translating system
On-line services software 
- convert step to catpart on web
Online CAD converter
A commercial online CAD converter
Additional links: Open step file, Open catpart file
STEP
Files with step extension are quite often found as 3D model / part files saved in STEP (Standard for the Exchange of Product Data) format.
CATPART
Files with catpart extension can be found as CAD part drawings created using CATIA software from Dassault Systemes.
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