What tool can be accessed within OneStream and used as an application version of the Excel Add-In?

The correct choice is the Spreadsheet tool. This tool is designed to provide a familiar Excel-like interface within OneStream, allowing users to interact with data in a way that resembles using Excel but is integrated into the OneStream platform. The Spreadsheet tool enables users to create, edit, and view data while leveraging the capabilities of OneStream for data management and reporting. This application version of the Excel Add-In allows for more robust functionality and seamless integration with the broader features of the OneStream platform.

The Data Loader is primarily focused on importing and exporting data, managing data integration processes, and does not offer the same interactive interface that users seek when working with spreadsheets. The Connector Manager is aimed at managing connections to various data sources for integration purposes and does not provide a user-facing spreadsheet interface. The Cube Design Tool is used for defining and modifying the structure of data cubes, which is essential for modeling but is not intended for day-to-day data manipulation or interaction in a spreadsheet format.