need help on ripping using Neosis and Blender

[mrwhite]

Import your .obj into blender. Select it, and press 'tab' to enter edit mode. Press 'P' and select 'All Loose Parts'. This could take some time. Once it's done, only a few faces will be selected. Press 'tab' to exit edit mode, than select all the meshes that you don't want and delete them.

well since the scene is huge, is there a way to speed deleting the undesired surfaces ? or is it to be picked one by one ?