Yes, you will.

For a hassle free Bonding to the Arc Ultra you should open the room with the Beam 2 and remove the Era 100 surrounds and Sub Mini. Doing so will revert the components to unassigned status making it easy to bond them to the Arc Ultra by selecting “add surrounds” and/or “add a sub”.

If you don’t reassign the Beam2 before setting up the Arc Ultra, I recommend setting up the Arc Ultra with a temporary name other than the one used for the Beam2 (you can change it later). Also, know that the Beam 2 (if unassigned) will show in the Sonos app for 3-5 days after it is removed. That is normal behavior as the unit will eventually disappear. 

Do not factory reset the Era 100’s nor the Sub-Mini.

Thank you for your insight in to my upgrade. I appreciate your time and knowledge. I didn’t understand what you met buy. “If you don’t reassign the beam 2 before setting up the Arc Ultra”  My beam is already setup with the system working fine. This is where I am confused.  Did you mean unassign the beam 2 then set up the Arc? Happy New year buddy.

Change BEAM’s Room name, then give ARC BEAM’s former Room name as you setup ARC.