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To fast track tasks as partial overlaps, first select two tasks and link them using the Chain Link icon in the Project 2007 menu (if they have not already been linked).
Then,
double-click on the second task to bring up the Task Information box.
Once this box is open, select “Predecessors.”
This will list all task dependencies leading up to the current task.
Under “type” select “Finish to Start.”
Next, in the Lag column you can adjust the overlap time between the two tasks. The way "Lag" works is as follows: if the number in this column is "0," The successor will be scheduled to start when the predecessor task ends. If the number in the Lag column is positive, this is the number of days between the finish of the predecessor and the start of the successor. To fast-track your project, you will set this number to a negative number. If the predecessor task is scheduled for ten days, and you want to begin the successor halfway through, set the number to "-5." Project will then adjust the schedule accordingly.