REUSE_ALV_GRID_DISPLAY + expand/collapse

Hi Friends,

I am using REUSE_ALV_GRID_DISPLAY. Now I need to expand/collapse for field TANUM.

TO(TANUM) has multiple line items. 

  how to add these symbol in ALV GRID.

 I have tried the SAP community site. after that, I have posted.

Thanks with regards,

Vallamuthu M.