Rolling 12 months Custom Measure for YTD model

Hi,

I have one Consolidation Model(YTD Model) and one Planning model(Periodic Model).

Data is uploaded from BW to BPC Consolidation Model with 13 Dimensions.

Data is transferred from Consolidation model(13 Dimensions) to Planning Model(8 Dimensions) using script logic.

User have to input Planning data for Budget and Forecast in Planning Model.

Planning model is having Custom Measure Rolling 12 months, we used this to create rolling forecast reports.

Once planning data(Budget and Forecast) approved, the same need to transferred to Consolidation Model using script logic.

I have data in Consolidation model with Actual, Budget and Forecast with 13 dimensions.

I have used below Rolling forecast measure in Periodic model.

Now i need to create rolling forecast with similar Rolling 12 months measure( I have used Periodic Formula as basis). Can anyone give some hint whether i have to use YTD formula or Periodic formula as basis and some tips on how to code this Rolling 12 Months measure in YTD model.

Thanks.