Answer / hari

create mapping like

source -- sorter -- expression -- filter -- target.

here sorter is used to send data by ascending order data
this is not mandatory.

Expression is need to create variable port which will count
the rows which are comming in.

Filter having condition like if count value >=51 and count
value <= 100.

Answer / venkateshmalneni

Generate sequence by using sequence generator or by using expression t/r
connect the output to the filter t/r in filter write the condition as sno>=51 and sno=100
connect it to the target

src--->sq---> expression--->filter--->target

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