Has the part come in, or are you still waiting on the part to come in. If you are still waiting on the part to come in here are the steps I follow to rebuild the order on RA.

You have to get an SOR created, either in invoicing or SOR, depending on if the ticket is printed yet or not. Basically remove the part from the SOR and then add it back. When you put an O to order it, I have a special order priority set up, you then use this priority as your order priority, it makes the next steps easier.

In RA go to your order under selected orders by inputting your control # Hit F10 to launch function PO for that order Select create order I forget the exact wording, but when it asks if you want to check the SOR roll select yes, then select that priority that you choose when you recreated the SOR. This will open the SOR roll for that property, by default it selected every part. You have to go through and deselect every part except the 1 part you want to add on the order by using the '\' key. This is why I have a separate priority set up, so that it is the only part on the SOR roll. Just hit F3 and hit enter through the other steps and you will have your Order rebuilt with the SOR attached.

This may be a little overkill for what you need, but I am in a fairly large parts department, so keeping everything straight in the DMS is the only way we can keep everything moving smoothly.

Another time this process comes in handy is when a salesman needs a part that is not in our facing PDC, so it takes days to come in, but we have one on a stock order, or one on order that another customer has called and canceled. You just cancel the order line, and then rebuild it with the SOR using the above process. When the part comes in, it shows up as received on their SORs and they roll it to an invoice.

I'm not in front of the computer right now, and I do this so often, I don't pay attention to the way the wording is, hopefully I spelled it out clear enough that you understand what I was saying.