Once you've compressed your sample maps, you can open one of them in the sampler and from the right click context menu select Tools > Redirect Monolith Reference, and select the monolith (ch file) that contains the "master" version of the samples.
For example if you have a staccato sample map, and you are also using the staccato samples as release tails you could redirect the release tails sample map to use the samples in the staccato monolith. You can then delete the release sample map ch file.
You might also need to use Engine.setAllowDuplicateSamples(false); but I can't remember if that's necessary.
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