Question

How can I make all vsplitted window as tab window?

Answer 1

you can do CTRL-W then T
or :wincmd T.

From the documentation:

                        *CTRL-W_T*
CTRL-W T    Move the current window to a new tab page.  This fails if
        there is only one window in the current tab page.
        When a count is specified the new tab page will be opened
        before the tab page with this index.  Otherwise it comes after
        the current tab page.

Note that :windo winc T does not work because windo will work only if you stay in the same tab. You can however do :windo wincmd T | tabprevious. (Thanks to Randy Morris for this).