Adding Information To A Read-only Table?

Hello,

I wasn't sure which area to post this question in...since it involves queries, tables, and forms :)

There is a read-only table in my company's data warehouse that stores a lot of records. I wish to set up a form that will allow users to add or relate data (fields) to each of those records.

Updating the data warehouse table structure is not an option.

How can I best do this...

1. set up my own table somewhere, that will automatically append any new data warehouse records every night, so basically I'll always have a copy of the DW table, but with additional fields that can be updated?

2. set up another table/query that are linked to the DW table via unique identifier...but if I do this, how do I display the DW records alongside the new fields in a way that makes sense? another query? will I be able to write in data in this fashion?

3. ...some other way?

Any assistance will be very much appreciated!