This is with very simple components made in sketchup standard 7.1, then the sketchup drawing opened in turbocad 16.0 build 36.7
All the components are treated by Turbocad as blocks. Explode all the blocks. Now the components are surface based 3d objects. Selecting them individually allows use of edit tool. Selecting more than one of them does not allow use of the edit tool. This is different and extremely inconvenient compared with 3d surface objects which are made within Turbocad, which can be selected en-mass and edit tooled.