I think you’re confusing the bundling.
Bundling bundles one title and everything that goes with the title so that you can transfer that single title to another person.
If you have 3 claimed titles, then those titles will be merged when you select for domain and settlement selection, you don’t get a choice to select multiple.
Currently you can either select a settlement and have it increase in size, bundle one or more of your titles and send them to someone else, or trade the title in for more EP.