Saving Resources of Deleted Users

By default when a user is deleted, all the resources associated with the user, such
as Dashboards, Alerts and Channels, are deleted. However, if there are resources
that you want to keep you can first delete the redundant resources and then
transfer the remaining ones to another user. 

TO SELECTIVELY DELETE RESOURCES IN:


Dashboards

In the All Dashboard window:
1. Filter by Creator
2. Select the Dashboard tiles you want to delete.
3. Click More >Delete. 
Alerts In the All Alerts window:
1. Select the User to be deleted using Filter by owner.
2. Select the Alerts you want to delete.
3. In the Alerts management panel, select More > Delete.
Channels  In the Channels window:
1. Select the User to be deleted using Filter by owner.
2. Select the Channels you want to delete.
3. In the Channels management panel, click Delete.

After deleting the selected objects, proceed with transferring the remaining
resources of the user you want to delete to another user and then delete user.

See Creating and Managing Users - To Delete a User