Each AutoCAD Electrical report is customizable:
Remove the TAGS columns from the BOM
In the Bill of Materials Data Fields to Report dialog box, Fields to report section, the fields that format the BOM are displayed.

The TAGS field is moved out of Fields to report and into Available fields.
Note: You can also select a field in the Available fields list to add it to the report. You can rearrange columns using the Move Up and Move Down buttons. Clicking Ok-Save As saves these settings to a file for later use.
Note: This new format becomes the default the next time you extract a BOM report.
The BOM data in the Report Generator dialog box is reformatted and displayed.