Assigning Parts To A Customers' "Workorder"

It's me again... :(

After getting (with a lot of help from ansentry) my database doing exactly what I wanted. I realised I wanted more... by my tiny mind can't see how to approach it - despite on the face of it looking like the simplest thing to do.

So here goes:

I have a table of customers. I also have a table of jobs, or workorders assigned to each customer. Each customer can have multiple jobs added at any time. All this works perfectly.

Now I want to assign parts (i.e. cables, tools, software) to each job. So each Job (sorted by WorkorderID) can have multiple parts added to it.

I'm using control tabs as well and would prefer it if I could use some kind of button on the Customers' Job summary view to "Add a Part".

Here's a link to my previous questions, complete with pictures....

http://www.access-programmers.co.uk/forums/showthread.php?t=108706

Ideally, it would be great if the Job Summary view I have made could also have a column saying how many parts have been used in the job. (This is very much a nice-to-have!)

I tried a search on the forums for clues, but I reckon I'm either not searching the right way or this is so easy no one else has asked it. Apologies in either case. Any help would be great... :D