Step 05 - Connecting the seat and back support.

106) We are going to create two conections. One will connect the back support to the seat.

107) And the other will connect the seat to the center of the chair.

108) Let's start with this second object. In the Front Viewport create an Spline like this:

109) With Shift Key pressed, use Select and Rotate tool and rotate this shape making a copy of it (like Mirror).

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110) Do not forget to Weld this central vertex with the Weld tool in the Vertex subobject.

111) After this you can delete this vertex pressing the Backspace on your keyboard. Now you have one single object. Select this four vertices.

112) And fillet them.