Manually write values on empty fields(as reference to calculated metrics on other dashboards)

Hello!

It would be nice to have the possibility to create an empty board/query/table (?) in order to manually write data on empty fields and use as reference for calculated metrics on other dashboards. 

Like, a price table that is used as reference to calculate final costs/minute of tickets  on other query's. 

This would be more user friendly comparing to the metric/attributes formulas configuration layout.