Why after going to quickbooks online from quickbooks desktop I cannot find old employees information?

Welcome to the Community, @Jackie8. 

Before we can proceed with your concern, I need more information about this. This way, I can provide you with the best possible advice. I'm curious as to how you went about migrating from QuickBooks Desktop to QuickBooks Online. Any extra information would be very helpful.

I keep an eye on your response. Keep safe!