[rules-users] Embedded sub-process in drools rule flow

Hi all, Can anyone please tell me whether it is possible to design nested blocks in rule flow. I know that using sub-process, we can embed different rule tasks, but my rule flow file is getting bulkier by the day and I wanted to know if i can have a few rules in a sub-process, but the rule tasks executed by the sub-process should not be visible in the uppermost layer. DOuble clicking on that should take me inside the sub-process and show the rules executed by it. Also if it is not possible to have such an operation with the build in blocks in drools rule flow, can anyone tell me how i can have a custom made block which has that functionality. I have designed custom blocks having simple properties, but i have no idea how this should be done. Hope to get an answer here. Regards sanjay