In order to add a baseline, do as follows:
Select the menu item Project > Baseline > Add. The dialogue box Add baseline opens.
Enter the name of the baseline in the field Name or accept the automatic name.
Click on the button OK.
Note: You can save any number of baselines in the project. This allows you to document your changes in the project, on the one hand, and provides you with the opportunity to analyse your project after its completion and use this information for further projects.