Hi Trinath,
Thanks for your interest on Syncfusion Products.
It is by design that the Cut, Copy commands are applied only on the selected items. If a Node is selected from the tree structure, it will not select sub-nodes. However, before executing copy command, the sub-nodes can be selected manually using IsSelected property. We have created a sample based on the requirements, and please refer the sample from the attachment.
Regards,
Maria Amal Raj T,
Diagram WPF & Silverlight Team,
[Syncfusion].
CutCopyPaste_19214afa.zip