If you want to use your Building Information Model data from an *.ifc file in Viswalk, you will have to convert the *.ifc file to an *.inpx network file. You can then import the network file (Importing INPX files including building data).
You may start the conversion process via Viswalk or a *.bat batch file (Starting conversion in Viswalk), (Starting conversion via a batch file).
Superordinate topic:
Modeling construction elements
Related topics:
Attributes of ramps and stairs, moving walkways and escalators