Remove SCCM Child Primary Site

MTS - Primary Central Site
SEC - Secondary Site
MT1 - Child Primary Site

Pictures below show on SCCM Child Primary console that Computer Collections and Native SCCM Central Site Software Deployment Packages and Advertisements are locked out.

Here is the  procedure how to remove MT1 SCCM Child Primary Site from its MTS SCCM Parent Site.
First step is to delete MT1 child site address from MTS Parent Site via SCCM console.

Next step is to execute Preinst.exe which is located in C:\Program Files (x86)\Microsoft Configuration Manager\bin\i386\00000409 folder:

Executing Preinst /dump shows SCCM sites in SCCM Parent Central Site. The target is to remove MT1 Child Primary Site.

 

Delete jobs for MT1 site: Preinst /deljob MT1

Delete MT1 site: Preinst /delSITE MT1 MTS

Execute again Preinst /deljob MT1 to delete any job in meantime

Executing again Preinst /dump comand shows that MT1 Child Primary Site has been removed from SCCM Parent site.

On SCCM Child Primary Server Console remove settings from Report to parent site to Central site

 

Finaly you can see that all locked out items have been removed. All Software deployments packages, Advertisments, OS deployment packages, and Task Sequences have been inherited form SCCM Parent site into SCCM Child Site and can be modified.