Here is a general conversion table showing how STEP entities are mapped to the ones of think3 when converting a STEP file to the think3 format.
| STEP entity denomination | think3 entity to which it is converted | AP (Application Protocol) |
| POINT | ignored | AP203/AP214 |
| LINE | Line | AP203/AP214 |
| CIRCLE | Arc | AP203/AP214 |
| PLANE | Plane | AP203/AP214 |
| CYLINDRICAL_SURFACE | Cylinder | AP203/AP214 |
| B_SPLINE_CURVE_WITH_KNOTS | NURBS curve | AP203/AP214 |
| MANIFOLD_SOLID_BREP | Solid | AP203/AP214 |
| UNCERTAIN_MEASURE_WITH_UNIT | Unit of measure | AP203/AP214 |
| Hierarchy | Assembly (*) | AP203/AP214 |
| PRODUCT_NAME | Component Name | AP203/AP214 |
| PRODUCT_ID | Component Name if COMPONENT_NAME is null | AP203/AP214 |
| COLOUR_RGB | Color | AP214 |
| PRESENTATION_LAYER_ASSIGNMENT | Layer | AP214 |
(*) See specific notes on assembly management in Converting from STEP to think3. See also the Assembly conversion modes area in the STEP Conversion Options.