:%s/^.\{n}//
Substitute n with number of characters you want to delete.
https://varuntv.wordpress.com/2013/09/11/delete-first-n-characters-in-a-file-vim-trick/
:%s/^.\{n}//
Substitute n with number of characters you want to delete.
https://varuntv.wordpress.com/2013/09/11/delete-first-n-characters-in-a-file-vim-trick/