This will create Reps-To attribute on the domain controller for the specified naming context. Ordinarily there is no requirement ...

This will create Reps-To attribute on the domain controller for the 
     specified naming context. Ordinarily there is no requirement to perform
     this command as the KCC will automatically create the RepsTo
     attributes on destination DSA's from other DSA's Reps-From entries.

     [SYNTAX]

     /addrepsto     [/selsecrets]