Two Lookups

Hi There,

I have a question regarding Look-ups:

I have three flat files,

     1. Source File

     2. Look-up File A (Orders File A)

     3. Look-up File B (Orders File B)

The Source file has a field Vendor No and I need to check if this Vendor No exists in Orders File A or Orders File B. If Yes I need to mark the record as X.

My question is can I use look-ups? If yes, Can I use two look-ups? If I can't use look-ups what is the alternative to achieve this. Any hints are appreciated.

Thanks,

Chan