[support] Node references

I’m working on a huge data management site that will have several content types all linked together and cross-referenced. Tasks can be assigned to different items, for instance and there will be a hierarchy. I will be utilizing CCK’s node references a great deal, but I’m having some problems. First off, I want to be able to create the referenced node and link it back to the referencing node. Is there a module that does this already? Also, I will need to clone nodes and also clone the nodes that are linked to that node. There are hundreds of node reference modules, but I can’t seem to find one that does what I need. Any advice? Joel