Using Partition components

We can use partition by expression. In PBE component we can mention

if (field<=250) 0
else if(field>250 && field<=500) 1
else if(field>500 && field<=750) 2
else 3

Use "Partition by round robin" and put BLOCK SIZE as 250.

You can use partition by % and say 25% for each port..
are you can use partition by range and provide the range of keys for each port

Use output_index in the reformat component and make count 4 for four outputs.

Partition by expression:next_by_sequence = 250