Selectable columns for display.

I'm probably using the wrong terminology, so please bear with me. I do welcome corrections though! That way I may get it right next time.
We have on our website a downloadable excel comparison table of differences in safeguarding legislation across England/Scotland/Wales/Northern Ireland/Southern Ireland/Jersey/Guernsey etc. Most people who need it are only trying to compare two areas - e.g. what are the differences in Safeguarding legislation in England and Scotland? Trying to do that with columns at opposite ends of the table is almost impossible!
Is it possible to set up a downloadable excel document so that they can choose (using say, a drop down list) just the two or three columns they need?
I know how to select/hide/etc columns - we need something simpler to use than that which does not rely on knowledge of how excel works.
By the way, our organisation is not commercial - it's a community interest company dedicated to improving safeguarding for children and adults at risk wordwide.

If you upload an example it will be easier.
You can have a tab - that has data validation lists of the countries in column B & C in row 1 for example (I am guessing col A will be the header)
Then Index find to fill it out the data =If($A$1<>"",Index(DataTab!$A$1:$Z$20,Row(),Match($A$1,DataTab!$A$1:$Z$1,0)),"")

Thanks CRIMEDOG, I'll give it a go!
This is the page I'm referring to, minus the hyperlinks. If an organisation works in say Ireland and Aldernay, I want them to be able to choose to display only those columns. Can be more than two areas needed.

Try this - Data validation rule: List in row 1
Index Match below - Note the change for each column : Match($B$1 - Match($C$1 etc...

Hi CRIMEDOG
Much appreciated. Not come across Array before (I'm self taught as far as it goes!) - useful. I reckon I can tailor this for what I need - thanks.
The array formula in B2 is {=IF(OR($B$1="",$B$1="(Choose One)"),"",INDEX(DATA!$B$1:$I$12,ROW(),MATCH($B$1,$B$1:$I$1,0)))}
I can cope with most of it, but don't understand (Choose One). How does that work? I assume it's something to do with the data validation list?
Cheers
Mike

It is not an array. The Choose one is just the first option in the list Look at Data!A1:I1 A1 is (Choose One). If that option is showing I would want the formula to return blank (and I would want the option to show so user would know what to do)
The formula will work without the {} brackets.

Hi CRIMEDOG
(Choose One); Obvious now you point it out - sorry for being a bit slow. Makes sense.
Array: I noticed the {} around your formulae which vanished when I tried to alter/extend. I looked them up and discovered Array/CSE - dead useful for the future.
Thanks again.
Cheers
Mike

Thanks for the info, this helped me out!