Hi there,  MerryLyn. 

Thanks for coming to the Community. I'm here to provide some insights about the limitations in QuickBooks Desktop.

In QuickBooks Desktop, there is a maximum entry you can have for each list. To learn more about these limitations, please check out this article: Maximum number of list entries.

Also, I'm adding these articles for more information about upgrading QBDT to a newer version:

• Upgrade QuickBooks Desktop Pro Plus, Premier Plus, or Enterprise.
• Upgrade your company files after you switch to a new version of QuickBooks Desktop.

Please keep me posted if you have other questions about upgrading in QBDT by commenting below. I'll be right here to help.