Configuration of Work Centers 
When you create a work center you have to enter the work center category with which you determine
Which data can be entered in the work center
Whether the data fields are mandatory or optional
In which task lists the work center can be used in
Whether change documents are created for the work center
Work center categories are defined in Customizing work centers under Define work center category .
You can also create a default work center for each work center category and a default capacity for each capacity category. You enter data in the default work center and in the default capacity that is copied when you create a work center or a capacity.