# How to Isolate a Part in a STEP Assembly in CADProps Find a component in the STEP model tree, isolate it for inspection, and restore the assembly view without changing the file. The STEP opens, but another component covers the bracket you need to inspect. In the [CADProps STEP viewer](https://www.cadprops.com/tools/step-viewer/index.md), open **Structure**, select the bracket in the model tree, then choose **Isolate**. The viewer hides the other components so you can turn the bracket and see its mounting faces. Choose **Show all** when you need the surrounding assembly again. ## Find the right occurrence before isolating it 1. Open the STEP and wait for the model tree. Expand the assembly or search for the component name. 2. Select the row and check which geometry highlights. If several copies have the same name, use their positions to identify the intended occurrence before isolating. 3. Choose **Isolate**. For a fit check involving two parts, enable **Multi-select**, select both rows and isolate them together. 4. Use **Show all** before recording a whole assembly view or deciding that a component is absent.
CADProps Model structure panel showing two blocks and the Isolate and Show all buttons
The Model structure panel for the Twin blocks sample. The rows identify two separate occurrences. Multi-select lets you keep both selected before using Isolate.
## Inspect a component and its mating part together Imagine a fixture with four clamps that all use the same name. If you are checking the clamp nearest the locating pin, select a candidate row and look at the highlighted position. Repeat until it is the clamp you intended. Then use **Multi-select** to add the baseplate and isolate the two together. Rotate the view to see the contact face while keeping the baseplate as a reference. This is a visual check of the exported positions. Compare a dimension or inspect the geometry separately if the task requires a numerical fit check. ## If the component is missing from the tree First restore visibility. If the component still has no row, inspect any loading warnings and compare the received STEP with the intended component list. A flat export may expose bodies without the original component hierarchy. If a part is absent from the exported geometry, ask the sender to reopen the exported STEP and confirm the intended assembly and components before sending a replacement. Use isolation to inspect geometry, especially faces that are hard to pick in the full assembly. It is a visibility change. If the recipient needs a standalone file for that component, request a separate part export from the authoring system and verify its revision and dimensions. For counts and aggregate properties, see the [repeated-instance STEP example](https://www.cadprops.com/guides/step-assembly-instance-properties-case/index.md). ## Related reading - [Open a Rhino 3DM File Without Rhino](https://www.cadprops.com/guides/open-3dm-without-rhino/index.md) - [Open CAD Files on Mac: STEP Viewers and Format Options](https://www.cadprops.com/guides/open-cad-files-on-mac/index.md) - [Open a Creo File Without Creo](https://www.cadprops.com/guides/open-creo-without-creo/index.md) - [Open DWG or DXF Files Without AutoCAD](https://www.cadprops.com/guides/open-dwg-dxf-without-autocad/index.md) - [F3D Files: How to Open a Fusion 360 Design Online Without Fusion](https://www.cadprops.com/guides/open-f3d-file-online/index.md) - [G-code Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-gcode-file-online/index.md) - [IFC Files: How to Open a BIM Model Online and What You Will See](https://www.cadprops.com/guides/open-ifc-file-online/index.md) - [JT File (.jt): What It Is and How to Open It Online](https://www.cadprops.com/guides/open-jt-file-online/index.md) - [NEU Files: How to Open a Creo / Pro/ENGINEER Neutral File Online](https://www.cadprops.com/guides/open-neu-file-online/index.md) - [PRC Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-prc-file-online/index.md) - [U3D Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-u3d-file-online/index.md) - [UNV Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-unv-file-online/index.md) - [VDA-FS Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-vda-file-online/index.md) - [X3D and X3DV Files: What They Are and How to Open Them Online](https://www.cadprops.com/guides/open-x3d-file-online/index.md) - [STEP Assembly Instances: Check Repeated-Part Totals](https://www.cadprops.com/guides/step-assembly-instance-properties-case/index.md) - [STEP File (.step, .stp): What It Is and How to Open It](https://www.cadprops.com/guides/step-file-what-it-is-how-to-open/index.md) - [Pack a CAD Assembly ZIP: Choose the Root and Keep Paths](https://www.cadprops.com/guides/zip-packaged-cad-models/index.md) Original article: https://www.cadprops.com/guides/isolate-part-in-step-assembly/ HTML page: https://www.cadprops.com/guides/isolate-part-in-step-assembly/