How can we 'drop off' past due Forecast when FC is loaded as monthly and spread evenly?

Summary:

Content (required):

In Planning Central, how can we 'drop off' past due Forecast when FC is loaded as monthly and spread evenly? Using FBDI, we load forecast in monthly buckets. In plan options, we set Forecast Spreading to spread Forecast evenly.

As plan is run throughout the month, how can we drop past due Forecast? For example, we load June FC of 3000 which is spread to 100 day for 30 days. Assuming no FC qty has been consumed, for a plan run on June 13, how can we drop the past due FC qty from June 1 ~June 12? Currently, the FC Demand Qty would be displayed as 1300 on June 13 and 100 on remaining days in June. How do we display this as 100 on June 13 and 100 on remaining days in June?