You can now enter either single or multiple category ID's in the Export program > Category ID field to allow you to pull out products by specified category ranges.
Whatever sub-categories exist underneath the category ID you put in will also be pulled out with it to save having to enter each individual one in.
If you need to pull out multiple categories (and each of their sub-categories), enter each category ID with comma separators e.g. 7,9,12.
This will save time when managing products via the Export program.
Once you have changed the exported products, then simply use the Import program to bring them back into the store.