How to re-use text values in a webform?
There is a hook in webform called hook_webform_select_options_info, that allows you to build a dynamic list of $items[] (return $items), which will be used as the list of options for your component.  What you put into this list can obviously be anything - i.e. how you decide what to put in is up to you.

I used it recently to create a multi-route dynamic web form where the path through the webforms is determined by a decision tree.  Ever option on every question is loaded from a JSON file, and depending on the answer, the next question (which could be any one) is shown.