I recently had a question regarding copying data after a filter had been applied. What if we wanted the top n items from a list to be copied to another place. The problem to address here is that a filtered list can have cells which are hundreds or thousands of rows apart.
Cascading combo boxes have been done online and I had a problem recently which knocked me for 6 as we say here in Australia. Anyone who deals in cascading combo boxes will know only too well that if you are using a list and the Indirect formula to manage the combo boxes then the process can get very unruly very quickly. One of the issues with comboboxes is that they are set up to work in sequence. Combo box 1 feeds into combobox 2 which feeds combo box 3. The combo boxes need to be filled out in that order.
I was recently working on an automated procedure to generate data in a list based on drop down (data validation) selection. The idea is to change items in a drop down (data validation) and have the corresponding data table filter to the specific items chosen in your drop downs. I have shown a formula based solution for this method (a long time ago) so if a more simplistic solution hits the mark - the link can be found here.