Cost basis is usually established when you buy (or otherwise add to the account) the securities.
SO, How did the securities get added to Q? What ACTION was used in your Q acct register?
You misunderstood the question, which was how did the shares of securities get added to the account in Quicken?
You have Bought and/or Added transactions in your account. Find them and edit them to enter the prices you paid for each lot of each security. That will set up your basis.
For taxes the cost basis doesn't matter for IRA accounts either Traditional IRA or ROTH IRA. In a ROTH IRA all distributions come out tax free.
It's true that cost basis is irrelevant in tax-advantaged accounts. But Quicken needs it in order to calculate gain & loss, which many people like to see despite that.
@ocman Double click on each ADDED transaction and it should bring up the "Edit Add - Shares added" dialog where you can input the "Total Cost", AKA cost basis
Try it and see
you really don't need to keep track of cost basis as @volvogirl stated in a Qualified account. if you want to understand your return, just run the investment performance report. it looks at the date you invested and the current value to determine the return; THAT is the 'return on investment'.
For example, when I do conversions, I simply move one of my holdings in my TRAD IRA to the ROTH IRA. That is a taxable event, but I do not buy or sell the security in question. But I do like to understand what the performance of the securities are from the date I transfered into the Roth, which is the benefit of the investment performance report - it doesn't need 'cost basis' to provide the ROI.
Further, I sometime want to understand performance from the time I purchased the security, regardless of whether it is in the TRAD or the ROTH IRA. Again, the investmern performance report gives me that answer - it doesn't need "Cost basis" to provide ROI.
Cost Basis is really only required to determine capital gains / losses for tax purposes, which is irrelevant for IRAs, whether Roth or TRAD