Trend-Based Expense Forecasting - Global/Default Assumptions?

Summary

Trend-Based Expense Forecasting - Global/Default Assumptions?

Content

We are in the process of setting up Trend-based Forecasting for Expenses. 

Is there a way to copy the same trends (i.e. Prior year Actual Average, Monthly Growth, etc.) to all Busarea/CostCenter intersections? Or maybe set up default values, where for example  "Prior Year Actual Average" will be the default value for "Travel Expenses" for any possible Busarea/CostCenter intersection. One option is to create a spreadsheet and submit via Smartview, but that spreadsheet gets pretty big when you have 500 BusAreas and 300 CostCenters...