Hi Docmedia,
Thank you for posting here in the Community space. I'm here to share information about entering time and managing QuickBooks Desktop.
Yes, your Executive can use both platforms interchangeably on the same projects. Make sure your QuickBooks Time and QuickBooks Desktop are integrated so the time entered will sync automatically.
For employees with Clock In and Out permission only, use the web browser to access QuickBooks Time on their PC. For the steps, check out this link: Clock in, switch jobs or customers, and clock out on QuickBooks Time Web.
Also, you can integrate QuickBooks Time for QuickBooks files created between 2015-2018 via Web Connector. You can visit this article to learn more about the QuickBooks integration process: Integrate QuickBooks Time and QuickBooks Desktop using Web Connector.
Let us know by dropping a comment if you need more clarification about entering time via mobile and managing QuickBooks Desktop. We'll be sure to help you. Have a great day ahead.