Currently have a single level IVR set up through AT&T Office@Hand. I want to switch to a multi-level IVR, but receive the following message when I click on the drop down box

"Warning: By switching to Multi-level IVR mode, all of your existing company call handling settings will be discarded. Please confirm that you wish to proceed"

If I switch to begin building out a Multi-Level IVR, what happens to the incoming calls for the single level IVR that was previously in place?