Koha has the ability to keep track of your authority records and how they're linked to your bibliographic records. Before using authorities you should configure several preferences.
Set Authority Frameworks aka templates
Authority System Preferences
BiblioAddsAuthorities : Decide if Koha creates authorities when cataloging
dontmerge : Decide if updates to authorities trigger updates to the bibliographic records that link to them
AutoCreateAuthorities : Decide when authorities are created
LinkerModule : Decide which match the authority linker should use
LinkerOptions : Decide if you want authority linking to be broader or more specific
CatalogModuleRelink : Decide if you want to enable authority linking while cataloging
Set up your cron jobs
Choose when the system looks for authorities updates to merge changes into bibliographic records