hi Denn,
I understand: you wish to have a single MyPack, which contains voices/styles from other packs.
That is only possible if you have normal packs which have ppf suffix in filename, i.e. ChurchOrgan.ppf or Latin.ppf. If your packs have cpf suffix (i.e. ChurchOrgan.cpf), then it's impossible to copy content from them into MyPack.
In case you gave ppf packs:
Step1:
Click on + button (on top, next to My Packs label) and choose Create Pack from menu. A new pack (grey) image will appear, which you can rename (to MyPack) anytime by clicking on it. At this point, pack is empty, of course.
Step2:
Make sure that MyPack is selected and click on + button (on the top of bottom panel). Now you choose Import Content from menu and you'll be asked which ppf pack you wish to import (and where on drive it is).
After you select desired pack, the whole content of that pack will be loaded into MyPack.
Step3:
Now you can remove unwanted items: select item on bottom panel, click on > button and choose Delete from menu.
Once you finished deleting items (now you only have "keepers" in MyPack), you can add content from another pack by repeating Step2 and Step3.
Step4:
Finally you create MyPack install file as described in my previous post.
Bogdan