How to create hybrid torrents that support following combinations or atleast tell which of these hybrid torrent combinations are possible?? :-

[1] v1 + v3

[2] v1 + v3.1

[3] v3 + v3.1

[4] v1 + v2 + v3

[5] v1 + v2 + v3.1

[6] v1 + v2 + v3 + v3.1

[7] v1 + v3 + v3.1

[8] v2 + v3

[9] v2 + v3.1

Because v3 is fully compatible with v1, there's no hybrid between the two.  Both v1 and v3 clients already connect and exchange pieces directly, and use the same hash-ID.  Think of it as v3 is already v1+v3.

The private v3.1 would not be private if it was be combined in a hybrid torrent with v1 or v2.  This would defeat it's purpose.

More info:
https://tixati.com/specs/bittorrent/v3
https://tixati.com/specs/bittorrent/v3.1

How to create a version 2 torrent now?

Version 2 has become redundant following the introduction of v3 in Tixati v3.39, so it is recommended to use v3.

As KH said
if you still want v2 then when you make a new seed, click on protocol >> and then click on gear icon >> checkmark "show all"