Hello,
For now, SAM can only run a simulation on a weather file with one-year's worth of data.
If you are using the SAM SDK, you can run a sequence of one-year simulations to generate output over a multi-year period.
If you are using the SAM desktop application, you could either write an LK script to run the sequence of simulations, or you could manually run a simulation for each weather file.
Best regards,
Paul.