This entry in the Quicken Help Website indicates that I should be able to Archive Transactions in my version of Quicken (Quicken 2017 - Windows).
https://www.quicken.com/support/how-archive-investment-transactions I don't have that option in my gear option. I'm using Quicken 2017 Premier Version R19.1
I would like to reduce the number of investment transactions in my active accounts and this seems like a good way to do it (if I could do it).