how do you reuse a wavelet packet tree structure?

I need to modify the coefficients of a wavelet packet decomposition at the 10th level. In fact, I only need to modify less than 10 coefficients, but of course at the 10th decomposition level there are 1024. Now that I have identified which packets I need to have, I can use wpjoin to remove all but 16 of the terminal nodes that I don't need. I see no functionality to reuse that structure to analyze other data sets.

[Eric Keller]

I noticed that plottree(treename) apparently ignores the tree structure that you have built and just goes and does a full decomposition to the level of the last leaf of the tree. I'm trying to kill plottree right now because it's been running for 10 minutes to plot a tree that takes microseconds to build.