How to do Export DXF/DWG solidworks as block

Hi every body

I ussing solidowkrs 2015. I can export 2D drawing solidworks to dxf/ dwg but when I open file dxf it cant' create

automatic block .I want to after export file auto creat block in dxft/dwg

Im sory becasue my english is very bad. Please watching myvideo

Help me

Thanks you verymuch@