I have just created a new catalog, is it possible for me to sync my lightroom moblie with the new catalog? My lightroom mobile is already connected with my old catalog and I can't figure out how to connect both of them.... And if I can't connect both of them, is there a way I can disconnect my old catalog and replace it with my new catalog without deleting all the data on the old catalog?
Thank you in advance for your help!
No you can't do that. You can only sync collections from one catalog on one computer to multiple mobile iOS and or Android devices.
So yes you can sync a collection from your new catalog to your mobile devices but the sync with the collections from your original catalog will be lost.