In a scenario I have col1, col2, col3, under that 1,x,y, and 2,a,b and I want in this form col1, col2 and 1,x and 1,y and 2,a and 2,b, what is the procedure?

Use Normalizer :
create two ports -
first port occurs = 1
second make occurs = 2
two output ports are created and
connect to target