Assignment Copy 
You use this function when the following two requirements are met:
You want to plan a resource for an assignment that stretches over several days.
The system does not allow splits. You must therefore create multiple assignments for the resource.
To make it easier to create assignments, you can create an initial assignment and then use it as a template for the other assignments (that can be either before or after the first assignment).
In Customizing under Define Planning Board Profile, you have activated the Copy Assignment function.
Create an initial assignment in the required period and choose Copy Assignment, or display the details of an existing assignment and choose Copy Assignment.
Enter a "from" and "to" date for the new assignments and choose Execute.
The confirmation screen contains a list of all assignments that are to be created. Choose Create to create them. To cancel the operation, choose Cancel.