When I need to create a dashboard from different workspaces!?

Hi. I'm sorry but you can't pin a visual from a report to a different workspace. The workspaces are built to relate their own components inside of it. You can relate them to a different one.

You might need to think again the distribution of your reports to check if the current way make sense or if you should get them together in single workspace.

Another way would be connecting a small new report to the datasets that can handle the visualizations you want to pin. Create that report in the main area with that single visual and pin it.

There is a third option creating a new dataset with the aggregated data for the dashboard. Then pin that report visuals.

I hope this helps,