Link and Unlink Activities
You can use the LInk/Unlink Activiteis dialog box to add and remove multiple relationships of the same type between activities conveniently.
Clicking the Link button automatically creates relationships between selected activities using the selected type, lag, and calendar.
You can also use the Add Relationship dialog box to define relationships between activities.
If relationships already exist between the selected activities, Open Plan does not allow you to modify the existing relationships.