Hi @tejaswini_peram ,

A Dashboard create with normal reports / performance analytics widgets can't be added to a workspace. You either need to recreate the the dashboard in the workspace or wait until Washington DC release, where there will be a migration option of dashboards to Platform Analytics.

https://docs.servicenow.com/bundle/utah-now-intelligence/page/use/dashboards/task/share-db-in-ac.htm...

If my answer has helped with your question, please mark my answer as accepted solution and give a thumb up.

Thanks & Regards,

Sumanth Meda