I have a old Links2 database. I want to keep it running while importing existing data to gliks SQL. Then as new data comes in (as new links are submitted), I want to import that later (say next month) before turning off the old setup and making sure SQL is working properly and all templates are setup correctly.

1) How do I go about importing data in chunks?

2) I have some extra fields added in my old links. After I import the data into SQL, is it possible to just remove and delete certain fileds across all records?

Thanks!