You can do this using the "extends" keyword in your rule. Rule "shopping cart total exceeds 4000, give 50% discount"        when          <condition>        then          <action>        end Rule "if order between 6 to 9 pm give additional discount of 20 %" extends "shopping cart total exceeds 4000, give 50% discount"        when                <condition>        then                <action> end You can also disable the first rule and just use "extends" to limit the amount of duplicate conditions in your rules. Note extends basically copies the conditions from the first rule to what is being extended, but I believe it will do what you are trying to do. Michael Rhoden VP - IT Development Franklin American Mortgage Company Direct: 615-778-1117 Fax: 615-778-2766 Email: mrhoden(a)franklinamerican.com ----- Original Message ----- From: "Pardeep Ruhil" <Pardeep.Ruhil(a)lntinfotech.com&gt; To: rules-users(a)lists.jboss.org Sent: Wednesday, August 12, 2009 2:44:38 PM GMT -06:00 US/Canada Central Subject: [rules-users] How to create nested rules in Drool Guvnor Hi, Thanks for replying. I have a scenario like Rule "shopping cart total exceeds 4000, give 50% discount"        when          <condition>        then          <action>          call Rule"if order is  between 6 to 9 pm, give additional discount of 20 %" end Rule "if order between 6 to 9 pm give additional discount of 20 %"        when                <condition>        then                <action> end .............. Also i have a  query like, Can we make rule like this Rule "shopping cart total exceeds 4000 give 50% discount"        when                <condition>        then                <action>                Rule "if order between 6 to 9 pm give additional discount of 20 %"                        when                                <condition>                        then                                <action>                end end Can we make rules like above? Thanks & Regards Pardeep Ruhil This email may contain confidential or privileged information for the intended recipient(s). If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. Thanks ______________________________________________________________________ _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Correction: extends works but is obviously undocumented. It adds the when part of the extended rule. -- View this message in context: http://www.nabble.com/How-to-create-nested-rules-in-Drool-Guvnor-tp249432... Sent from the drools - user mailing list archive at Nabble.com.