EBS R12 XML Publisher - how to have header and line in one table?

how can i do the following using RTF file (ms word)?

the col A and col B are header data, and Col C and D are line data.

i want the header data to show once.

col A       Col B        Col C         Col D
---------- ----------   ---------- -------------
inv1(head)  inv1(head) inv1(line1)   inv1(line1) 
                       inv1(line2)   inv1(line2) 
                       inv1(line3)   inv1(line3) 
inv2(head)  inv2(head) inv2(line1)   inv2(line1) 
                       inv2(line2)   inv2(line2) 

I created table in ms word as follow but it doesn't work. it still show values in col A and B for line 2 and 3..