Dynamic Action on IT0105

Hi,

I need to write dynamic action for following scenario:

Whenever value is maintained in 'System id' field of IT0105, Subtype 9000, then this value should be copied to the 'System Id' field of Subtpy 9001.

For example, If we create Home Phone in IT0105, Subtype 9000, then the same home phone should be copied in Subtype 9001 also. If we delete Home phone in subtype 9000, then automatically home phone in subtype 9001 should also be deleted.

Regards

KP