Thanks for update, i get a map from ODI but without SGA_ and i need to duplicate the record to map to the Target.
Mapping : 12345678 > 12345
Data: 12345678 > 12345 (Explicit Map)
SGA_12345678 > 12345 (Needs to be mapped)
Don't know if FDM can handle this without having the Map for SGA_12345678 > 1245.
You can use Logic Accounts to duplicate source data. Then you can map logic accounts.
Another option are import scripts to generate extra records.
Are you interested in processing the two records (original and generated)?
If you are only interested in the generated then you can just add a prefix when importing data.