Made a copy of register, now that info is missing on the online account. How do I reverse this?

Hello there, slherbruck,

We're unable to remove the data completely in QuickBooks Online. Though, there's an option to make accounts inactive. 

Here's how to make an inactive account active again:

1. On the left panel, click Transactions and select Chart of Accounts.
2. Above the Action column, click the Settings option (small gear icon).
3. Put a check mark in the Include inactive box.
4. Look for the inactive account, and click Make active.

Let me know if you have further questions.