import source in var-fdtd
I would like to get an E-field profile using 3D fdtd and then use var-fdtd to further propagate the light.
For example, light is coupled to a slab via a grating coupler (simulation using 3D fdtd) and then propagate it in the slab using var-fdtd.
Is it possible to do it in Lumerical? I do not see an option for importing a source in var-fdtd.