Prepare your file output by hiding any Models or Model Items that you dont want to include in your export directly inside the Navisworks Scene. 

To export to IFC or IFCZIP file format us the Ribbon and go to CellBIM tab > IFC IFCZIP and choose your file extension (either *.ifc or *.ifczip). Then wait for the export process to finish. 

If you have CellBIM for Excel installed you can also export directly to CellBIM for Excel using CellBIM tab > CellBIM for Excel. This export will additionally include texture information found in the Navisworks file and it will also make it available for viewing with your Oculus VR device using the CellBIM for Excel VR support.

Export for CostOS Estimating BIM Software is also available using CellBIM tab > CostOS BCT.

To uninstall Close Navisworks and go to Add/Remove Programs and find CellBIM for Excel and IFC Exporter and uninstall it.