How to copy data from another series ?

Hi,

We have a requirement to take  a copy of current data and store this. Example current month Seres A to be stored in Series B. So at anytime we should be able to see Series A and Series B.

Please advice me how to achive this?

1) Is there a std functionality of copying data from Series A to Series B ?

2) Do I need to create a custom procedure and setup a Workflow linking this procedure?

What are my options?

Thanks

rgds

Aqil