Query to find all Work Items contributin to a Deliverable?

Hello

What is the best practice to support this use case:

- Pre-Development, I have a number of Deliverables (one example being a Word Document containing a product vision).
- There are a number of work items, that collectively lead to the intended Deliverable over time (e.g. "Check in Template", "Create initial Draft", etc.).

--> I would like to find all work items for a particular deliverable.

Now, I don't even know how to link a work item to a deliverable (other than creating a link to a URI, but this has a number of drawbacks).

Thanks for any help!

Best regards, Martin