Block Update

The question is vague and incomplete but I will have a go anyway.
Let’s call them Task A (FS0 predecessor) and Task B (FS0 Successor).
Let’s say that they are the only two Tasks in the network.
No other Task is a Predecessor or Successor of A or B.
Let’s say that the project is scheduled forwards from a start date (not backwards from a Finish Date) and all Tasks are scheduled to start as soon as possible, ie on their Earliest Start.
Let’s say that neither A or B have date constraints.
Let’s say that both A and B use the same Calendar
As you can see, it takes a lot of assumptions.

You want to "update" Task A, in some way not described, which results in the Finish of Task A changing, either being now earlier or later than it was before the "update".

The "update" could be:
the planned start of A has changed
the planned duration of A has changed
the actual start of A has changed
the actual duration of A has changed
the actual finish of A is different

The whole point of linking the tasks FS is to have the finish of A determine the Early Start of B, that is to have the change in the finish of A result in a change to the start of B.

Why would they be linked at all if you did not want that to happen?

Only if B has an actual start will Task B not be pushed or pulled by either the planned or actual finish of A
etc etc..

Hi Trevor,
Thank you for your response. These assumptions are all valid.
The point is, that I would like to have control over the beginning of task B, I would like to authorize whether the change in task A really affects task B or it will be absorbed in task B’s schedule.

Thanks,
Assaf.

remove relationship and/or apply constraints

The thing is I cannot apply constraints - these 2 activities are between two different files. I want to see the schedule as every gantt manager designed it.