u click the person on ur team that u want to use bee on and use his mystery

Idk if it works on Bee, but as I used on my previous lineup Mabui/Tenten/Darui, I controlled who will be the target of Mabui/Azure standard heal when all of them have full HP, so I cn always cast her mystery despite prompt acupuntures/immobiles.
What I did was to "place" Tenten first into the lineup, before all other ninjas including the main. Now, you might wanna say "the main ninja cannot be removed from the lineup".
Yes, you cannot, unless it's Matsuri/Survival. Now, to make Tenten the target of standard heals, drag her up, and put her down back to her tile. Proceed to the next ninja
in the priority order, drag and drop on same tile. The last ones you will be dragging up and placing down would be the healers, or in your case, Bee.
I personally haven't tried this on Bee/Kurenai, and other ninjas that target allies. You can try.
As for the Mabui/Tenten/Mei or Darui team, that strategy works 100%. Certainly comes in handy in space time autos.

In short: The target of standard heals is the ninja that is "first" to be dragged up and placed down on its tile. Make sure you go all the way through the fourth ninja to make the priority order work. The fourth ninja to be dragged and dropped down is considered the "last" ninja, and thus, will not be the subject of standard healing unless its hp is the lowest (with suffered dmg).

Fun fact: The "ninja with the lowest life" description in most healing abilities is based on the targets % HP in proportion to its own total HP pool. Thus, if all your ninjas have full HP, the one with the lowest HP value don't necessarily get to be target of the healing standard. The system seems to calculate HP proportions relative to its full value, based on percentages.

in an auto arena like the space time bee uses his 'yo' on the team member with the lowest life.

Yes, that's why I said I have not tried it with Bee/Kurenai or other ninja with same manual-target supportive mysteries.
Just thought it could work the same as I did to the Mabui/Tenten team. Sad it doesn't work.
Now, some people say Bee's Yo! actually targets ninja with the lowest HP pool, so try to arrange your life magatamas/runes so that your target ninja gets the lowest of the 4 ninjas. Careful not to overdo it, as your target ninja's survival may be compromised.

Well to make it so bee gives the extra sandard to minato you have to remove all ninjas from line up and then put minato first, not first position, he just needs to be the first ninja you put in the line up, then roshi main and bee, try it on kakashi clones on auto twice just to be sure. When Jin treasure 1 was released i used to run Roshi Water main Bee Sailor sakura for space time and i did that so bee would cast yo on sakura and it always did.

You basically just rephrased what I said. :D
I thought he tried it but didn't work, so I couldn't think of any other ways to make it work.
Hope it does work for him.

Hye bro,, from what i undrstand here, your problem is that you want bee to cast his mystery either on minato or roshi when in auto mode right. So what u gonna have to do is, when u set ur lineup, u need to put the first ninja that u want bee to cast his mystery on him in ur lineup..okay maybe abit confusing here from what i explain..let me give u an example..for example u want bee to cast his mystery on minato, so u need to put minato the first ninja in ur lineup when u set ur lineup team..I mean remove all your ninja first from lineup..Then put minato first in ur lineup then followed up by bee, then roshi, then lastly is ur main..So by doing that way, your bee will cast his mystery on your minato..Same goes if u want ur roshi to get double move from bee,, Put roshi first in the lineup then followed by bee, then minato n last ur main..Thats how you do it for auto lineup.. n enjoy the game XD

1 Issue with your tenten.

Every time you move your ninjas around you end up changing their gear. So when you placed them in a certain way Tenten ended up with the least amount of life. That is why Tenten received heals that she did.

Well to make it so bee gives the extra sandard to minato you have to remove all ninjas from line up and then put minato first, not first position, he just needs to be the first ninja you put in the line up, then roshi main and bee, try it on kakashi clones on auto twice just to be sure. When Jin treasure 1 was released i used to run Roshi Water main Bee Sailor sakura for space time and i did that so bee would cast yo on sakura and it always did.