Once a MODFLOW simulation has been saved by GMS using the Save command in File menu, the entire simulation can be read back into GMS using the Open command in the File menu.
MODFLOW simulations can be read in individually (*.mfs) or as part of a project (*.gpr). They can also be imported by using the MODFLOW name file. The extension for the name file must be changed to *.mfn
Related Links:
Open
Importing an Externally Defined Simulation
Saving a MODFLOW Simulation