SCOm Console UI has by default been set to retrieve only 500 items when using ‘Add Object’ in larger environments this can be extremely limiting when defining reports etc.
So to resolve this there is a registry change that can be applied.
## Backup you registry first before changing any thing ##
Add a new DWORD called MaximumSearchLimit in
HKEY_CURRENT_USER\Software\Microsoft\Microsoft Operations Manager\3.0\Console
Set the decimal value to what is good for your environment I would advise between 3000 and 10000.