In my site I have two lists. These lists need to sync together. Since I can't create a list within a list, my only other option that I am aware of is to create two lists and sync them together by using an ID.
My first list allows a user to enter a project and needs an ID (the only way I can get the lists to sync?). The second list (Task List) will allow other users of a project to make comments and updates. I was advised when a user makes an update for example: to 'Comments', we want to keep the previous 'Comment' and still view the new 'Comment' in the list (a rollup list-this is why I thought using an ID would be a good idea).
How do I create a manual ID in SharePoint Lists without using a SharePoint ID (auto) to get this done? Is it possible to have more than one line item share the same ID number to sync or corelate to another list?