Importing a Harness Description List (.KBL) File Add a complex cable harness (defined in a .kbl) to the cable assembly for analysis. On the Home tab, in the File group, click the Import icon. From the drop-down list select the KBL File (*.kbl) icon. Figure 1. The KBL Importer Tool dialog. In the Filename field, browse for the file you want to import. [Optional] Select the Represent all segments as straight lines check box if it is required to represent curved segments as straight segments. Click the OK to import the .kbl file and to close the dialog.