Hi,
In windows explorer there is a work shelf context menu in SendTo. I can use this to add a single file or folder to a shelf tab. But, when I select multiple files or folders it is not adding all selected multiple files and folders instead it adds only one file or folder.

How can add multiple files and folders to a work shelf tab using Windows file explorer right click menu?

Also, is there similar feature for Send to Dock or Send to NexStart?

"Send to" is one of those small "quality of life" improvements. Because of how it works under-the-hood It is only meant to work with a single file - if you want to add multiple files at once, use drag & drop.

For instance, I have Microsoft Notepad in my "Send to" list. If I try to Send To more than a single text file to Notepad, the operation fails.