Redmine

For issue tracking in our software , we have just started using redmine.

Our software is in the development since last 12 years and it is planned to use for similar or more time in future.
One of the key challange we are facing is , over long period of time , developers/designers/testers tend to forget coreltation between issues/features.Hence it is very time consuming to identify correct design change/ testcases for adding new features

To circumvent this kind of situation , It is better if system is having trackback facility.For e.g. consider follwing scenario
where Function1 had introduced defect1 ,defect2,defect3 and it is having feature1,feature2 etc.

Function1
 |-Defect1
 |-Defect2
 |-Defect3
 |-Feature1
     |-Defect4
     |-Defect5
            |-Defect6
 |-Feature2
     |-Defect7
     |-Defect8

In the above situation , when developers identify defect5 has caused defect6 . for a better system check , it is better if user checks consistancy of feature1 and fucntion1 and developer does not need to test feature2 and its children as well defect4. this requires trackback facility in issue management system where user should be able to identify all parents of issue (all parents of Defect6 in current example)

With current redmine, I can add a custom field for addition of parent item. But still I can search for only 1 level and not till root level.
Please do let me know if I can achive my requirements using some customization.

Regards
Imran Sheth