Hi pafurijaz, there is a choice of topology under Options > "SubD import options" > "Patch type". But the current settings there are focused on how extraordinary vertices are handled (vertices with other than 4 edges coming out from them).

It is also additionally possible to control topology by materials though, if you have Options > "SubD import options" > "Use materials" turned on then polygons that belong to different materials in the .obj file will not get merged together into a larger patch.

Or for another possibility you can use Construct > Curve > Iso to extract isocurves out from the large surface.

- Michael