colspan and collapse for the same header - possible?

I am new to dhtmlx. Currently developing a table using dhtmlx grid. I need to achieve the below table construction. I tried many way to achieve this but I couldn’t able to apply the colspan and collapse for the same td element in the header. Please check the attachment and help me to get the exact output.

Thanks in advance,
Arun Kumar S

Unfortunately it is not available to achieve the exact behavior that is on your screenshot.
You may only use the column 3-5 collapse but without the colspan.