Update or Modify Project Baseline Program in P6

Refer to Project Management, the Baseline Program is the approved schedule by all stakeholders i.e. Client, Engineer & Contractor/Sub-Contractors, and once approved no alterations are permitted. Baseline program is used as ruler to measure the performance against which.
No project executed as 100% as planned therefore for the project under execution there are instances when changes are required and/or mandatory e.g.
a) Client added new scope to the project which required to add more activities to the PoW
b) Modify activities relationship to suit current project situations
P6 offer tool to modify the Baseline automatically, the changes made in the Current program which is the updated program can be transfer to the assigned BL program using "Maintain Baseline" then select "Update" tool.
The command offers numerous choices related to activity attributes from actual data, expenses, budgeted units and cost..
However, the default P6 settings does not offer to modify the activity relationship which needs to be selected by the user himself.
P6 itself offers multiple types of BL programs from "Project Baseline" to User Baseline, kindly check following video to demonstrate differences between various types    • Baselines Explained in Primavera P6 Software