SAP PP MRP planned orders only for specific (eg every second, third etc ...) month

Dear All,

There is a given schedule we plan to make some of our semi finished products (monthly, every 2nd 3rd etc month). This depends on (BULK). These semi finsihed parts assemble into a Finished products (FG) where we have montnly PIR's (sales fc). In the short term plans we mannually group FG and BULK productions orders according to our desired schedule (eg every second month). But where the MRP generates the planned orders they will be generated into every month.

I need some help to group FG planned orders into a specific shedule. Is SAP ECC capable for this?