Hi @LamSar
For the Q1:
How / where do we edit the existing data models after the migration? At this point we add measures, add tables,... using tabular editor or Visual studio.
After you migrate the data source from AAS to Power BI Premium, you can edit the data model by connecting with Power BI Desktop or Tableau Editor, you can refer to the following link.
Connect the data source by Tableau Editor
Connect Tableau to Power BI Datasets - Visual BI Solutions
Connect the data source by Power BI Desktop.
Connect to datasets in the Power BI service from Power BI Desktop - Power BI | Microsoft Learn
Q2:How / where do we create a new datamodel: In Power BI service? or do we keep doing that in Visual Studio?
(1)You can create a new data model in Power BI Desktop, then publish it to the Service. But you need to import data source to it first. You can refer to the following link.
https://learn.microsoft.com/en-us/power-bi/fundamentals/desktop-getting-started#connect-to-data
How to Build a Power BI Data Model: 2 Easy Steps - Learn | Hevo (hevodata.com)
(2) You can create a new data model in Visual studio, then deploy it to Power BI Service.
https://learn.microsoft.com/en-us/power-bi/enterprise/service-premium-connect-tools#deploy-model-pro...
https://learn.microsoft.com/en-us/power-bi/enterprise/troubleshoot-xmla-endpoint#deploying-a-dataset
Best Regards!
Yolo Zhu
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