...
In Earthdata Search, "subsetting services" refers to optional order customizations offered by data providers for select products. These may include data reformatting (e.g. NETCDF, GeoTIFF, KLM etc), data reprojection, data subsetting, and other option. Collections for which subsetting services are available are indicated with the label "SUBSETTING" following the collection name.
To specify the services you want, when ordering choose the "Customize Order" option.
Please note that subsetting services are not offered for all products, and not all subsetting-capable products support every option.
To filter your search for products that only support subsetting, check the "Features | Subsetting Services" checkbox on the level in collection view.
...