What feature allows users to set aside specific areas of a sheet for notes?

The correct option is the feature that enables users to designate specific areas of a sheet for notes, which enhances collaboration and organization within the planning environment. This feature allows users to add comments or important reminders directly on the sheet itself, providing contextual information without cluttering the main data presentation.

By using sheet notes, users can ensure that their thoughts and observations are accessible to anyone who accesses the sheet, facilitating better communication among team members. The visual placement of notes directly beside relevant data can improve understanding and ensure that key points are not overlooked during reviews or presentations. This functionality is particularly useful in collaborative planning scenarios, where multiple stakeholders may need to contribute insights or updates over time.

In contrast, other options do not serve the same purpose. Read-only cells restrict editing capabilities, Increment adjustment is related to changing data values in a controlled manner, and Rollup cells summarize data from multiple inputs but do not provide a space for notes. Hence, the sheet notes feature is specifically designed for capturing additional, context-rich information alongside the data itself.