No, a Sub cannot be assigned to more than one Arc at a time. 

Wow! What a waste of money, space and technology… then I’ll “manually” move the bar and Connect it to these different TVs… and for next time… maybe don’t buy a sonos… 

Thank you for the quick reply! Best regards…

Is it possible to add two ERA or Beam to the same Sonos arc + sub in the same room? This is because i’m trying to use the arc with one tv and the ERas or Beam with the other tv but connected all together to the same sub. Thank you.

No.  As stated above, sub and/or surrounds can be bonded to one soundbar and one soundbar only.  To assign it to another room you must remove it from one and add it to another.  

And, last chance. If i add an Arc to the same room as the other arc and sub, and then create a gruop with them, (maybe assigning one room for the new arc to Connect it to my actual arc+sub+One Sl System in different room) can i heard the same subwoofer for all The “agruped” Arcs/rooms/sonos speakers? (I don’t need different sound but the same sound in all sonos speakers: arcs, sub) Thank you. 
 

(i don’t want to buy another sub and occupate more space in my room with it, but i want to add another front speaker using the rooms and groups features if it’s possible, and when i have a tv “on” The other Tv will be off and will not send audio to his ARC, even if send audio because the group, there will not a problem, because i’m always using one tv at the same time).

Come on, are not any solution for people with the same config as me?

thanks again.

Grouping is not a solution for TV sources because the grouped room will be delayed by about 75 ms, causing an echo effect.  Also, the grouped room has all channels down mixed to stereo, ruining any Atmos or surround effects.   Basically, there is no way to get around buying two subs. 

Ok… Thanks for the help

Finally, i bought a new arc and a new sub for the other TV in the same room and everything fine. Now, i need to connect as surround speakers two totally wireless speakers. Can i do this with two Roam2?.

Again, no. The specs on surrounds are here:
 

https://support.sonos.com/en-us/article/surround-sound-guidelines-and-limitations

Ok, ok, Thank you for your help. And please, could you tell me whar of the list are totally wireless as a Roam2?

• Amp
• Connect:Amp
• Era 1001
• Era 3001
• Five
• One (Gen 1)
• One (Gen 2)
• One SL
• Play:1
• Play:3
• Play:5 (Gen 2)
• SYMFONISK Bookshelf (Gen 1)
• SYMFONISK Bookshelf (Gen 2)
• SYMFONISK Floor lamp2
• SYMFONISK Picture frame
• SYMFONISK Table lamp (Gen 1)
• SYMFONISK Table lamp (Gen 2)2

thank you!

None.  There are no portable Sonos speakers that can be used as surrounds.