Creation of tasklist for functional location using IA11

Hi All,

please help me with the below situation.

I have a requirement in which i need to create a tasklist for functional location by coping another task list using TCODE IA11.

as of now when we create a new tasklist using another task list as a model the entire operations are getting copied , but in my requirement i need to copy only those operations based on the Control key field.

so how can i copy only particular operations from a tasklist based on some conditions.

where can i add the custom code for this.