Using a Subset GRD image in a preprocessing workflow

I have set up a preprocessing workflow for a Sentinel 1 GRDH image in Graph Builder. Can I use a subset of the image rather than have to run the workflow for the entire image?

As long as the subset is stored in the BEAM DIMAP format you can apply all GRD operators in the subset as well.

Thanks for your reply - this has certainly shortened the processing time now