How to make a return selected text variable? see below...

I am building a questionnaire and already created variables for text box entries which work flawlessly.

I need to find a way to add the following functionality:

User needs to select area(s) they work within (this will make more sense if you continue to read). 

I currently have checkboxes set up next to text, then realized you can add text within the text box field but haven't done so yet as I don't know how this will work if at all. 

I NEED to be able to create a variable to return the information from any and all boxes selected to a results slide, mock results slide outline is:

Thank you %Name% for completing the quesstionnaire

%Name%, %Position% is now certified to work with

%????% (data pulled from checked boxes or other form of data gathering you think would work)

Thank you for %years% of services with COMPANY NAME.

The only reason I used checkboxes is due to the fact I have yet to figure out the drow down menu box feature, but that is definitely an option if you can provide brief tutorial on how to build it.  The Name, Position, and Years text results are working as planned, only need the %????% to be fully functional.

Thank you in advance for your assistance.