Hi Pardeep,
you cannot nest rules. You can solve the situation with 2 rules like:
<br>
<pre>rule "big amount discount"
  when
    Basket( total > 4000 )
    discount: Discount()
  then
    discount.percentage = discount.percentage + 20;
end

rule "preferred time discount"
  when
    Clock( 6 < time < 9 )
    discount: Discount()
  then
    discount.percentage = discount.percentage + 20;
end</pre><br>
Please note that I did not use correct Drools language notation, it is just the example how to solve your problem.
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