Tar/Untar in a Flow?

Hi,

A common workflow I want to express in globus is to:
- select a directory
- tar it
- move the tar file to a new destination
(essentially what `htar` does for HPSS)
- optional: remove the tar file.

And the opposite:
- copy a tar file to a new destination
- untar it
- optional: remove the tar file.

Is there a flow for this or could this be made an example?

Currently, for really large data sets I am still doing a combination of Globus + screen for untar, and there must be a better way.