Hi Rajesh.
Well, we just have the information for P5. So just want to share with you in case you need.

Question 1: What is Resource Leveling and what does it do?
Answer 1: Resource Leveling is a process which helps to ensure that sufficient resources are available to perform the activities in your
project, according to the plan. Resource leveling works by moving an activity to a time when it’s resources are all available to work on the
activity and as such can push out the end date of your project. Resource Leveling can be performed against any resource, regardless of the
Resource Type (Labour, Non Labour and Material resources can all be leveled).

Question 2: How does the Leveler decide the order in which activities will be leveled?
Answer 2: Activities enter the Leveler one at a time. The order in which activities enter the Leveler is decided as follows:
1. All activities without predecessors (or whose predecessors have all been leveled already) are considered first
Note: Logic is always obeyed when leveling: an activity cannot enter the leveler until all of it’s predecessors have been leveled.
2. If there is more than one activity without a predecessor, or with leveled predecessors, leveling priorities are used as a tie breaker
Note: Leveling priorities can be viewed and set at Tools, Level Resources in the "Leveling Priorities" section
3. If there is still a tie, after leveling priorities have been considered, Activity ID is used as the final tie breaker
Note: Activities from different projects may have the same Activity ID which would seemingly produce another tie. However, the Activity
ID which is used to break the tie is the data’s "internal" Activity ID, which runs in order of the time and date of the activity’s creation.

Derive from Primavera