Automatic changes

M

med111

Hi all,
When changing the start of task in Project Pro 2007, other data are
automatically modified. for example when we change start of task,
there is 2 cases :

-the finish of task will be modified and the duration does not change

-the duration is modified and the finish doesnot change

On which these behaviours are based on?
How we can efficiently set these behaviour at the way that we want?
 
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