jwalk15 --
This CAN be accomplished in Project Online, but you MUST have the Professional version of Microsoft Project 2016. If you have the Standard version of Microsoft Project 2016, then you will not be able to use Project Online to create the master project (you refer to this as an integrated schedule). If you DO have the Professional version of the software, then your Project Online app admin will need to add you to the Project Managers security group, and he/she will need to add the members of each of the groups to the Portfolio Viewers group. Members of the Portfolio Viewers group will be able to view the master project (integrated project) in the Project Center page of PWA.
In addition, if you DO have the Professional version of the software, then you will need to do the following:
1. Create a PWA Login account in Microsoft Project to connect your software to Project Online (refer to
https://learn.microsoft.com/en-us/projectonline/connect-to-project-online-with-the-project-online-de... for the steps).
2. Launch Microsoft Project and connect to Project Online.
3. Individually open each project that will become part of the master project.
4. Save each project to Project Online and then publish each project as well. Close and check in each project, when finished with the Publish job.
5. Open a new blank project and insert each of the published projects as a subproject of the master project.
6. Save and publish the master project, then close and check in the project as well.
After you have done all of this, then the members of the Portfolio Viewers group will be able to view the master project (integrated project) on the Project Center page in PWA. To see the individual subprojects, they will need to select the "Gantt Chart" checkbox and the "Subprojects" checkbox in the Projects ribbon on the Project Center page. Keep in mind that members of the Portfolio Viewers have permission to view every project in Project Online, but they are limited to Read-Only permissions for every project. In other words, they can see every project, but they cannot edit any projects.
As you can see, to accomplish what you want to do CAN be done with Project Online, but doing so may be more work that you are willing to do. And please note that creating a master project IS NOT possible in Project for the Web. Hope this helps.