My google-fu was hurting on this one and didn't really turn up much. I originally had trouble finding what I wanted in Quicken Help ... primarily because a wrong turn quickly led me to their horrific support site which turned up nothing relevant.
After I stumbled on how to do it myself, I did find their instructions in the application help file, under Contents -> Investing -> Tracking Bonds and CDs -> How do I... -> Buy a Bond (though you will have to add the bond to the security list before executing the "buy a bond" steps if you are adding a US Savings Bond).
The way I did it was essentially the same, but in more of a streamlined manner (well, I thought so anyway):
- I added an account, chose "not a financial institution" and called it US Treasury
- Once in the US Treasury account window, I chose "Enter Transactions"
- I used 200510I for the security name
- I used 100 for number of shares (this differs from Quicken instructions)
- I used 1 for cost per share (this differs from Quicken instructions) for a total cost of $100
- Quicken prompted me to add 200510I to the security list, I left ticker symbol blank and clicked next
- On the next screen I chose "add manually" and security type of U.S. Savings Bond
- On the next screen I entered the maturity date (+30 years on the first of the month) and accepted the asset class of "domestic bonds"