Extract cc package from a merged package

Hello everyone,

I’m currently organizing all my CC Sims and also removing CC that I no longer need.

For this purpose, I converted the Sims from Sims3Pack files into a package file in order to access the CC.
Using the Package Viewer, I noticed that some package files contain multiple package files inside them (see the attached Screenshot).

Is there a way to extract these files from the package file?

Thank you all.