Need a little explaining..

[mvlcek]

I've been searching for something like this, and it sounds like the simplest solution to what I want to do which is similar to what otoom wanted. I do have a question. How would I get this to work with multiple portfolios other than make a different function for each portfolio? "getPortfolio1();", "getPortfolio2(), "getPortfolo3();" etc etc.

Just add a parameter to the function and call it with getPortfolio('portfolio1') (portfolio1 being the parent page):

Code:

function getPortfolio($parentpage){
    $subpages=getChildren($parentpage);
    ...

Also, will this work if i already have the i18N custom fields plugin installed?

I18N Custom Fields is an extension of Mike's Custom Fields, so it should work.