How to do some line header,not span?

I want to get the following grid

header1|header2|header3
ID1Data|Name |
|Name2 |OtherData
header1|header2|header3|header4
ID2Data|Name |
|Name2 |OhterData
|Name3 |otherdata|Otherdata2


like the above, Have two head,1 and 4 lines,but they are not continuous. How to realize it in one grid? Need to two grid?
many thanks.