0SD_C03 Extractor enhancement

Hi,

I want to add 2 standard business content fields to extractors of cube 0sd_c03 & 5 Z fields (or custom fields)

We currently have 2 million records existing for this cube in BW,

Q1- How do i do it?

Q2- What are the steps to do it?

Q3 - How do i add Zfields to standard extractor ?

Q4 - What are the transactions for it ?

Q5- Adding new fields to existing cube, how will these change the Data? or do i have to delete data and reload again ?

thnx

Hem