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1. Create the overall (coarser) model
2. Create the smaller (finer) model
3. Open the smaller (finer) model
   1. Specify 'open' boundaries. 
   2. Change forcing to 'time series'
4. Open the larger (coarser) model (see Figure 1below)
   1. Go to the Nesting toolbox and 'Nesting - 1'
   2. Specify the grid, enc and bnd file of the finer model. 
   3. Generate the 'admin' file by clicking on 'Make Observation Points'.
   4. Define the time step of the observation points
   5. Save all your Delft3D-FLOW files
   6. Run the coarser model
5. Open the smaller (finer) model (see Figure 2)
   1. Go to the Nesting toolbox and 'Nesting - 2'
   2. Specify the history and admin file.
   3. Click on 'Run Nesting'. Boundary conditions can be generated for the “Hydrodynamics” and also “Transport” (e,g, salinity).

Image Added

Figure: With the Nesting toolbox two model are loaded and coupled. The idea is that the Nesting Toolbox will generate observation points in our large (coarser) California model and the output of these observation points is used in the second (finer) model of the San Francisco Bay