Importing from another LR catalog

[Jumajan]

I am trying to clean up my LRC catalogs.  I have SO many of them!  I've been using the "Import from another catalog", and it's working fine.  However, once I have imported into my existing catalog, can I then delete the ones that are still sitting in my folder?  I'm really confused!   I have attached a view of my folder - LOOK AT THEM ALL!  There must be a lot of redundant files here, right?  Please help!      

[AxelMatt]

If the import is completed successfully your can delete the appropriate catalog including all corresponding folders.

Before you delete some files I would recommend to make a backup of all files.

Here you'll find a lot of tips do to a merging and cleanup: Merging Catalogs - The Overview | The Lightroom Queen