Understand that this is true said by Dave-Kreskowiak
You cannot export a single value. You would have to write your own tool to do that
A bat would do that, but use a filter and a temp file:
>nul reg export "%_hkey%" "%tmp%\TMPDinesh.reg" /y
type "%tmp%\TMPDinesh.reg" | findstr /v Dinesh.=
del /q /f /a "%tmp%\RegExportDinesh.reg"
Output (content) resulting in the file:
Windows Registry Editor Version 5.00
After exporting and filtering, generating your reg file, then you can import:
Reg import "C:\Temp\Dell_Reg\Dell_Test.Reg"