Hi @JRichman5,
Unless you’re working from a sandbox, all of the changes you make in HubSpot and which you apply are in the production environment: Create a sandbox and deploy changes to production
In general, unless you specifically see a button in some tools (like the email or workflow editor), there is no reverse button. Saved changes are applied and can typically not be reversed through one or two clicks only.
Depending on which changes you made to your pipelines, you’ll have to retrace them and restore the pipeline stages you had before.
You can then bulk edit your records to put them into the correct stages again: Bulk edit records
If those movements are too complex, you can export the property history and re-import it: https://community.hubspot.com/t5/Tips-Tricks-Best-Practices/Reverting-Bulk-Property-Changes-by-Importing-Historical-Property/m-p/332929
Best regards