The IFC Exporter in Revit allows you to export only elements that are currently visible in the view. You can use this option to isolate only the elements you wish to export rather than the entire project.
However, some elements, even though visible in the view, may fail to export in the IFC if the Detail Level of the view is not set to “Fine.” Below you can see the view with the Detail Level set to Medium.
The following is the resulting IFC loaded in Solibri Model Checker, which has missing pipe fittings in the model.
To work around the issue, ensure that when exporting only elements in the view, you have the Detail Level set to “Fine” as seen below.
The resulting file should no longer have missing elements as seen below where the pipe fittings are present.