Duplicate applications for users with different database

Douglas_Silva,

You can define data model, create reports in your own Power BI Desktop file, then create servername parameter and database parameter in your current Power BI Desktop file and create a Power BI Report template(PBIT).

After that, your clients can use the PBIT to instantiate new Power BI reports on  their machine by choosing their server and database. They can publish their own Power BI Desktop file to Power BI Service and schedule refresh for their datasets.

For more details about parameters and Power BI templates, please review the following blog and similar thread.
https://powerbi.microsoft.com/en-us/blog/deep-dive-into-query-parameters-and-power-bi-templates/
https://community.powerbi.com/t5/Desktop/How-to-create-a-template-with-a-different-data-source-every-time/td-p/50969

Regards,

Douglas_Silva,

I am not very clear about your requirement. If you create reports and dashboard in your workspace in Power BI Service, you are able to share the reports/dashboard to your clients, but your clients can't change connection string of the reports/dashboard.

If you want to share gateway to your clients, your clients and you should be in same domain. In this case, you can add the email address of your clients under Administrators tab to share them the registered gateway.

Regards,
Lydia Zhang