Looking for a way to append a taxonomy term with a hierarchy

I'm trying to use a Freetag to append to an existing taxonomy hierarchy.

I can get it to add the term but not in the right place. It adds it as a distinctly new parent item.

Taxonomy1 -->cck content taxonomy - has hierarchy
freetag --> cck content taxonomy - single entry

so the user pick their way through taxonomy1 and then adds a free-tag. Just trying to get it to add that tag to the end of taxonomy1 in the right place. So eventually it will be a complete taxonomy.

Tried using this token set but it just created a new item and didn't append it.

[node:field_taxonomy1-terms],[node:field_freetag-terms]

eg. parent --> child -->freetag

Is this even possible?

Vmpwraith