I am confused about your posting.
You said you are backup to disk and clone to tape. Do you mean that you are cloning from disk after the save sets are on disk for two week? This is a automatic process that you can setup. However, you only end up with one set of tapes.

If you are cloning at the same time, you are backing up to disk. Then you will have two sets of tapes. Both with the same save set data one from two week and one from the disk to clone.

I could be off, But if you are trying to go from disk to vapor land with the data. I do not think Networker will do this as far as I have seen. I know of two other backup software will let you do this.

I use automatic cloning and yes after two weeks on disk I want to go from disk to vapor land as you put it and still being able to use my clone tapes.

Create a seperate retention policy for the Savesets staged to disk. This has nothing to do with your Cloned sets. Networker will keep them around for the time period specified then remove them.

I have found the solution for my question.

I can achieve what I want by first using nsrmm to remove the saveset information from media index and then using nsrstage to remove the savesets physically from disk.