User Defined Fields has an Indicator option that allows four indicators to be displayed. These may be used in conjunction with a Global Change to indicate the status of an activity in respect to a Baseline.
If you wish to learn how to create a P6 Indicator column and set with a Global Chane then please read this article I have written by clicking on this link>>>.
Many construction contracts specify that a delay must be calculated from the critical path of a program.
Often project programs are completed Microsoft and therefore to demonstrate a delay the scheduler needs to add delays to the program to evaluate the delay.
If you wish to understand the various techniques of assigning delays to activities in Microsoft Project program, click on this link>>>.