At the controlling phase start, before making any modifications involved by the project tracking, it can be useful to save a baseline. This will help you to compare the schedule updated at a later stage with the planned schedule. From the Baselines menu it can be created (Save... command), deleted (Clear...), or compared with the actual project state in Gantt graph (Show.../Hide). You can save up to 10 baselines for each project.
A baseline contains the following task data: start date, end date and %complete. It will appear in Gantt Chart as yellow colored bars (by default, but the color can be changed) under the actual taskbars.
Attention: Because each project have its own baselines, if the current project is set on All projects, the commands related to baselines are not available.