T.code for sttlement,variance and overhead calculation

Dear friends ,is there any T.Code that can be used for settlement of particular range of production orders. What I understood is that in ko88,individual order can be processed and in co88 period wise settlement is possible, other than this is there any t.code to process a group of orders or a particular numbers of orders. And also is there any t.code for Overhead and variance calculation in the same scenario.

Please give me an answer