Code Migration to CCentral

Hi,

I have job in CCentral.Now the underlying table has got changed, with 2 new columns and i want to make changes to the DataFlow in the job for mapping the new columns.

Can some one tell me step by step process for this.

I usually do the below

* Check out the DS and reimport it,check in back the table.

*Check out the DataFlow alone and make required cahnges and check in back

Now when moving this to ELocal ( QA) , do i need to exclude the data stores ?? if so how will my db changes be reflected in qa