Conversion from CATIA to Onshape is not supported yet :(

CATIA is a multi-platform software kit for CAD/CAM/CAE, PLM and 3D, created by the French company Dassault Systèmes.

Commonly referred to as a 3D PLM software suite, CATIA supports all stages of product development, including conceptualization, design, engineering and manufacturing. CATIA facilitates collaborative engineering across disciplines around its 3DEXPERIENCE platform, including surfacing & shape design, electrical, fluid and electronic systems design, mechanical engineering and systems engineering. CATIA facilitates the design of electronic, electrical, and distributed systems such as fluid and HVAC systems, all the way to the production of documentation for manufacturing.

Onshape is a CAD software system, delivered via internet. It is focused on mechanical CAD and is used for product and machinery design in many industries, such as electronics, machinery, medical devices, 3D printing, machine parts and industrial equipment.

It makes use of cloud computing, with computer-intensive processing and rendering performed on Internet-based servers. Users are able to interact with the system via a web browser or the iOS and Android apps.