Lookup date in a module

reachraj

 

Hello,

Learning anaplan and am looking for options to do below without using list for lookup in the module . Not sure if there is a simple calculation within module that will help me implement  below

In the module today we have  Status Date and Completion as line items. If we have to populate new line item ( Start  date & End date) on rows with 'Done' as completion , how can I do that. To populate start date I need to look up a different row in the module to get status date, wondering how I can do this with look up in a module.