[CentOS] how to reinit an own repo after adding files?

Hallo,
I try to use my own repo.
The problem:
The repo is working when using it while installing a fresh system using pxe and kickstart.
When changing the content and rebuilding the repo new packages are not found.
My question:
What is the right way to reinit a repo complete? I tried several hints I found in the web but new packages are never found.

Thanks
Ralf

Von meinem iPad gesendet