The answer is No. Workbench is not present in business one. The reason being the core of business one is not based on ABAP or NetWeaver.
Business one relies heavily on SQL. It has a SQL database and you can write queries for fetching data. These data are then used for creating reports.
But When you analyze business one with ABAP, the extension capabilities are very little in business one as available in ABAP.
But you have other options for achieving the same; you can integrate with either JAVA or .NET using their connectors for writing your custom requirements.