Thanks a lot to Alex, Stephen & Robert for your time & providing different solutions.

Thank you all.

Challenge is here, I am trying to map through portal UI (static one for temporarily) which one do I need to select here?Global Database location is not a single DB for our use case. 

Thank you very much, Robert.

Those 120 mapping lines need to be dynamic enough -  121st old month mapping line  needs to be dropped & new mapping line needs to be created for every 1st day of upcoming new month. Trying to come up with some classes for this logic and needs to be built in Global Mapping.