This wizard is the most performant option if you need to import large amounts of RDF data into a database that can be opened with TopBraid. Right click on a target folder or project in the Project Explorer, go to import and find the Import RDF Files into a new TDB wizard. In the wizard, please specify the base name for the database files, e.g. "myTDB". Then enter a base URI that shall be used as named graph for the new triples originating from triple-based RDF files. Files with quads in them will ignore this setting. Finally, use the Add files button to select that files that you want to import. The wizard will populate the databases and finally create connection files.
Note that this wizard requires a 64 bit version of Java.