Problem to split 1000 participants in zoom meeting

Hello,

Your approach to this is a little confusing.  Why didn't you just get two Zoom licences and buy the 500 participant large meeting add on?

In your scenario, the only approach I can think of is to use breakout rooms.

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0062540

Perhaps you could preassign the participants?

Regards